diff --git a/common/src/main/java/net/woggioni/envelope/Common.java b/common/src/main/java/net/woggioni/envelope/Common.java
index ac95ce0..11dbaac 100644
--- a/common/src/main/java/net/woggioni/envelope/Common.java
+++ b/common/src/main/java/net/woggioni/envelope/Common.java
@@ -1,24 +1,27 @@
 package net.woggioni.envelope;
 
+import lombok.AccessLevel;
+import lombok.NoArgsConstructor;
+import lombok.SneakyThrows;
+
 import java.io.BufferedInputStream;
 import java.io.BufferedOutputStream;
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileOutputStream;
+import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.security.DigestInputStream;
 import java.security.MessageDigest;
 import java.util.AbstractMap;
 import java.util.Map;
+import java.util.MissingFormatArgumentException;
 import java.util.Optional;
 import java.util.function.Supplier;
+import java.util.stream.Stream;
 import java.util.zip.CRC32;
 import java.util.zip.ZipEntry;
-import lombok.AccessLevel;
-import lombok.NoArgsConstructor;
-import lombok.SneakyThrows;
-import java.io.IOException;
 
 @NoArgsConstructor(access = AccessLevel.PRIVATE)
 public class Common {
@@ -114,4 +117,144 @@ public class Common {
         OutputStream result = new FileOutputStream(file);
         return buffered ? new BufferedOutputStream(result) : result;
     }
+
+    /**
+     * @param template  Template text containing the variables to be replaced by this method. <br>
+     *                  Variables follow the format ${variable_name}. <br>
+     *                  Example: <br>
+     *                  "This template was created by ${author}."
+     * @param valuesMap A hashmap with the values of the variables to be replaced. <br>
+     *                  The key is the variable name and the value is the value to be replaced in the template. <br>
+     *                  Example: <br>
+     *                  {"author" =&gt; "John Doe"}
+     * @return The template text (String) with the variable names replaced by the values passed in the map. <br>
+     * If any of the variable names is not contained in the map it will be replaced by an empty string. <br>
+     * Example: <br>
+     * "This template was created by John Doe."
+     */
+    public static String renderTemplate(String template, Map<String, Object> valuesMap) {
+        return renderTemplate(template, valuesMap, null);
+    }
+
+
+    public static int indexOfWithEscape(String haystack, char needle, char escape, int begin, int end) {
+        int result = -1;
+        int cursor = begin;
+        if (end == 0) {
+            end = haystack.length();
+        }
+        int escapeCount = 0;
+        while (cursor < end) {
+            char c = haystack.charAt(cursor);
+            if (escapeCount > 0) {
+                --escapeCount;
+                if (c == escape) {
+                    result = -1;
+                }
+            } else if (escapeCount == 0) {
+                if (c == escape) {
+                    ++escapeCount;
+                }
+                if (c == needle) {
+                    result = cursor;
+                }
+            }
+            if (result >= 0 && escapeCount == 0) {
+                break;
+            }
+            ++cursor;
+        }
+        return result;
+    }
+
+    public static String renderTemplate(
+        String template,
+        Map<String, Object> valuesMap,
+        Map<String, Map<String, Object>> dictMap) {
+        StringBuilder sb = new StringBuilder();
+        Object absent = new Object();
+
+        int cursor = 0;
+        TokenScanner tokenScanner = new TokenScanner(template, '$', '$');
+        while (cursor < template.length()) {
+            tokenScanner.next();
+            int nextPlaceHolder;
+            switch (tokenScanner.getTokenType()) {
+                case TOKEN: {
+                    nextPlaceHolder = tokenScanner.getTokenIndex();
+                    while (cursor < nextPlaceHolder) {
+                        char ch = template.charAt(cursor++);
+                        sb.append(ch);
+                    }
+                    if (cursor + 1 < template.length() && template.charAt(cursor + 1) == '{') {
+                        String key;
+                        String context = null;
+                        String defaultValue = null;
+                        Object value;
+                        int end = template.indexOf('}', cursor + 1);
+                        int colon;
+                        if (dictMap == null)
+                            colon = -1;
+                        else {
+                            colon = indexOfWithEscape(template, ':', '\\', cursor + 1, template.length());
+                            if (colon >= end) colon = -1;
+                        }
+                        if (colon < 0) {
+                            key = template.substring(cursor + 2, end);
+                            value = valuesMap.getOrDefault(key, absent);
+                        } else {
+                            context = template.substring(cursor + 2, colon);
+                            int secondColon = indexOfWithEscape(template, ':', '\\', colon + 1, end);
+                            if (secondColon < 0) {
+                                key = template.substring(colon + 1, end);
+                            } else {
+                                key = template.substring(colon + 1, secondColon);
+                                defaultValue = template.substring(secondColon + 1, end);
+                            }
+                            value = Optional.ofNullable(dictMap.get(context))
+                                .map(m -> m.get(key))
+                                .orElse(absent);
+                        }
+                        if (value != absent) {
+                            sb.append(value.toString());
+                        } else {
+                            if (defaultValue != null) {
+                                sb.append(defaultValue);
+                            } else {
+                                throw new MissingFormatArgumentException(
+                                    String.format("Missing value for placeholder '%s'",
+                                        context == null ? key : context + ':' + key
+                                    )
+                                );
+                            }
+                        }
+                        cursor = end + 1;
+                    }
+                    break;
+                }
+                case ESCAPE:
+                    nextPlaceHolder = tokenScanner.getTokenIndex();
+                    while (cursor < nextPlaceHolder) {
+                        char ch = template.charAt(cursor++);
+                        sb.append(ch);
+                    }
+                    cursor = nextPlaceHolder + 1;
+                    sb.append(template.charAt(cursor++));
+                    break;
+                case END:
+                default:
+                    nextPlaceHolder = template.length();
+                    while (cursor < nextPlaceHolder) {
+                        char ch = template.charAt(cursor++);
+                        sb.append(ch);
+                    }
+                    break;
+            }
+        }
+        return sb.toString();
+    }
+
+    public static <T> Stream<T> opt2Stream(Optional<T> opt) {
+        return opt.map(Stream::of).orElse(Stream.empty());
+    }
 }
diff --git a/common/src/main/java/net/woggioni/envelope/Constants.java b/common/src/main/java/net/woggioni/envelope/Constants.java
index ff35a1b..345c169 100644
--- a/common/src/main/java/net/woggioni/envelope/Constants.java
+++ b/common/src/main/java/net/woggioni/envelope/Constants.java
@@ -1,9 +1,10 @@
 package net.woggioni.envelope;
 
+import lombok.AccessLevel;
+import lombok.NoArgsConstructor;
+
 import java.util.Calendar;
 import java.util.GregorianCalendar;
-import lombok.AccessLevel;
-import lombok.NoArgsConstructor;
 
 @NoArgsConstructor(access = AccessLevel.PRIVATE)
 public class Constants {
@@ -16,10 +17,12 @@ public class Constants {
     public static final String SYSTEM_PROPERTIES_FILE = METADATA_FOLDER + "/system.properties";
 
     public static final String LIBRARIES_TOC = METADATA_FOLDER + "/libraries.txt";
+    public static final char EXTRA_CLASSPATH_ENTRY_SEPARATOR = ';';
 
     public static class ManifestAttributes {
         public static final String MAIN_MODULE = "Executable-Jar-Main-Module";
         public static final String MAIN_CLASS = "Executable-Jar-Main-Class";
+        public static final String EXTRA_CLASSPATH = "Executable-Jar-Extra-Classpath";
         public static final String ENTRY_HASH = "SHA-256-Digest";
     }
 
diff --git a/common/src/main/java/net/woggioni/envelope/TokenScanner.java b/common/src/main/java/net/woggioni/envelope/TokenScanner.java
new file mode 100644
index 0000000..34ddab3
--- /dev/null
+++ b/common/src/main/java/net/woggioni/envelope/TokenScanner.java
@@ -0,0 +1,74 @@
+package net.woggioni.envelope;
+
+import lombok.Getter;
+
+public class TokenScanner {
+
+    public enum TokenType {
+        ESCAPE, TOKEN, END;
+    }
+    private final String haystack;
+    private final char needle;
+    private final char escape;
+    private int begin;
+    private final int end;
+
+    @Getter
+    private int tokenIndex = -1;
+
+    @Getter
+    private TokenType tokenType = null;
+
+    public TokenScanner(String haystack, char needle, char escape, int begin, int end) {
+        this.haystack = haystack;
+        this.needle = needle;
+        this.escape = escape;
+        this.begin = begin;
+        this.end = end;
+    }
+
+    public TokenScanner(String haystack, char needle, char escape, int begin) {
+        this(haystack, needle, escape, begin, haystack.length());
+    }
+
+    public TokenScanner(String haystack, char needle, char escape) {
+        this(haystack, needle, escape, 0, haystack.length());
+    }
+
+    public void next() {
+        int result = -1;
+        int cursor = begin;
+        int escapeCount = 0;
+        while(true) {
+            if(cursor < end) {
+                char c = haystack.charAt(cursor);
+                if (escapeCount > 0) {
+                    --escapeCount;
+                    if(c == escape || c == needle) {
+                        tokenIndex = cursor - 1;
+                        tokenType = TokenType.ESCAPE;
+                        break;
+                    }
+                } else if (escapeCount == 0) {
+                    if (c == escape) {
+                        ++escapeCount;
+                    }
+                    if (c == needle) {
+                        result = cursor;
+                    }
+                }
+                if (result >= 0 && escapeCount == 0) {
+                    tokenIndex = result;
+                    tokenType = TokenType.TOKEN;
+                    break;
+                }
+                ++cursor;
+            } else {
+                tokenIndex = result;
+                tokenType = result < 0 ? TokenType.END :TokenType.TOKEN;
+                break;
+            }
+        }
+        begin = cursor + 1;
+    }
+}
\ No newline at end of file
diff --git a/gradle.properties b/gradle.properties
index 47ab112..4327f61 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,7 +1,7 @@
 woggioniMavenRepositoryUrl=https://woggioni.net/mvn/
 publishMavenRepositoryUrl=https://mvn.woggioni.net/
 
-lys.version = 2023.06.13
+lys.version = 2023.06.22
 
-version.envelope=2023.06.13
+version.envelope=2023.06.24
 version.gradle=7.6
diff --git a/launcher/src/main/java/net/woggioni/envelope/Launcher.java b/launcher/src/main/java/net/woggioni/envelope/Launcher.java
index 5d1088d..e35f1b6 100644
--- a/launcher/src/main/java/net/woggioni/envelope/Launcher.java
+++ b/launcher/src/main/java/net/woggioni/envelope/Launcher.java
@@ -10,16 +10,27 @@ import java.io.Reader;
 import java.lang.reflect.Method;
 import java.net.URI;
 import java.net.URL;
+import java.nio.file.Files;
+import java.nio.file.Path;
 import java.nio.file.Paths;
+import java.util.AbstractMap;
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.Enumeration;
 import java.util.List;
 import java.util.Map;
+import java.util.Optional;
 import java.util.Properties;
+import java.util.TreeMap;
 import java.util.function.Consumer;
+import java.util.function.Function;
 import java.util.jar.Attributes;
 import java.util.jar.JarEntry;
 import java.util.jar.Manifest;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+import static net.woggioni.envelope.Constants.EXTRA_CLASSPATH_ENTRY_SEPARATOR;
 
 public class Launcher {
 
@@ -53,6 +64,65 @@ public class Launcher {
         }
     }
 
+    private static Map<String, Map<String, Object>> createContextMap() {
+        Map<String, Map<String, Object>> dictMap = new TreeMap<>();
+        dictMap.put("env", Collections.unmodifiableMap(System.getenv()
+            .entrySet()
+            .stream()
+            .map(entry -> new AbstractMap.SimpleEntry<>(entry.getKey(), (Object) entry.getValue()))
+            .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue))));
+        dictMap.put("sys", Collections.unmodifiableMap(System.getProperties().entrySet().stream()
+            .map((Map.Entry<? super String, Object> entry) -> (Map.Entry<String, Object>) entry)
+            .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue))));
+        return Collections.unmodifiableMap(dictMap);
+    }
+
+    private static Stream<JarFile> getExtraClasspath(Attributes mainAttributes) {
+        return Common.opt2Stream(Optional.ofNullable(mainAttributes.getValue(Constants.ManifestAttributes.EXTRA_CLASSPATH))
+                .map(manifestAttribute -> {
+                    Map<String, Map<String, Object>> dictMap = createContextMap();
+                    return Common.renderTemplate(manifestAttribute, Collections.emptyMap(), dictMap);
+                }).map(extraClasspathString -> {
+                    List<String> paths = new ArrayList<>();
+                    int cursor = 0;
+                    while(true) {
+                        int sep = Common.indexOfWithEscape(
+                            extraClasspathString,
+                            EXTRA_CLASSPATH_ENTRY_SEPARATOR,
+                            EXTRA_CLASSPATH_ENTRY_SEPARATOR,
+                            cursor,
+                            extraClasspathString.length()
+                        );
+                        if(sep < 0) break;
+                        paths.add(extraClasspathString.substring(cursor, sep));
+                        cursor = sep + 1;
+                    }
+                    return paths;
+                }))
+            .flatMap(List::stream)
+            .map(Paths::get)
+            .flatMap(new Function<Path, Stream<Path>>() {
+                @Override
+                @SneakyThrows
+                public Stream<Path> apply(Path path) {
+                    if(Files.isDirectory(path)) {
+                        return Files.list(path).filter(childPath -> !Files.isDirectory(childPath));
+                    } else {
+                        return Stream.of(path);
+                    }
+                }
+            })
+            .filter(path -> path.getFileName().toString().toLowerCase().endsWith(".jar"))
+            .map(Path::toFile)
+            .map(new Function<File, JarFile>() {
+                @Override
+                @SneakyThrows
+                public JarFile apply(File file) {
+                    return new JarFile(file);
+                }
+            });
+    }
+
     @SneakyThrows
     public static void main(String[] args) {
         Enumeration<URL> it = Launcher.class.getClassLoader().getResources(Constants.SYSTEM_PROPERTIES_FILE);
@@ -94,6 +164,8 @@ public class Launcher {
                 else sb.append((char) c);
             }
         }
+
+        getExtraClasspath(mainAttributes).forEach(classpath::add);
         Consumer<Class<?>> runner = new Consumer<Class<?>>() {
             @Override
             @SneakyThrows
diff --git a/src/main/java/net/woggioni/gradle/envelope/EnvelopeJarTask.java b/src/main/java/net/woggioni/gradle/envelope/EnvelopeJarTask.java
index ebdb856..41c6165 100644
--- a/src/main/java/net/woggioni/gradle/envelope/EnvelopeJarTask.java
+++ b/src/main/java/net/woggioni/gradle/envelope/EnvelopeJarTask.java
@@ -20,6 +20,7 @@ import org.gradle.api.java.archives.internal.DefaultManifest;
 import org.gradle.api.model.ObjectFactory;
 import org.gradle.api.plugins.BasePluginExtension;
 import org.gradle.api.plugins.JavaApplication;
+import org.gradle.api.provider.ListProperty;
 import org.gradle.api.provider.Property;
 import org.gradle.api.provider.Provider;
 import org.gradle.api.tasks.Input;
@@ -86,6 +87,9 @@ public class EnvelopeJarTask extends AbstractArchiveTask {
     @Getter(onMethod_ = {@Input})
     private final Map<String, String> systemProperties = new TreeMap<>();
 
+    @Getter(onMethod_ = {@Input})
+    private final ListProperty<String> extraClasspath;
+
     private final org.gradle.api.java.archives.Manifest manifest;
 
     public org.gradle.api.java.archives.Manifest manifest() {
@@ -156,6 +160,7 @@ public class EnvelopeJarTask extends AbstractArchiveTask {
         manifest = new DefaultManifest(fileResolver);
         mainClass = objects.property(String.class);
         mainModule = objects.property(String.class);
+        extraClasspath = objects.listProperty(String.class);
         JavaApplication javaApplication = getProject().getExtensions().findByType(JavaApplication.class);
         if(!Objects.isNull(javaApplication)) {
             mainClass.convention(javaApplication.getMainClass());
@@ -286,6 +291,11 @@ public class EnvelopeJarTask extends AbstractArchiveTask {
                 mainAttributes.put(new Attributes.Name("Launcher-Agent-Class"), Constants.AGENT_LAUNCHER);
                 mainAttributes.put(new Attributes.Name("Can-Redefine-Classes"), "true");
                 mainAttributes.put(new Attributes.Name("Can-Retransform-Classes"), "true");
+                String separator = "" + Constants.EXTRA_CLASSPATH_ENTRY_SEPARATOR;
+                String extraClasspath = EnvelopeJarTask.this.extraClasspath.get().stream()
+                    .map(it -> it.replace(separator, separator + separator)
+                    ).collect(Collectors.joining(separator));
+                mainAttributes.put(new Attributes.Name(Constants.ManifestAttributes.EXTRA_CLASSPATH), extraClasspath);
                 if(mainClass.isPresent()) {
                     mainAttributes.putValue(Constants.ManifestAttributes.MAIN_CLASS, mainClass.get());
                 }