diff --git a/src/com/annimon/ownlang/annotations/Modules.java b/src/com/annimon/ownlang/annotations/Modules.java
new file mode 100644
index 0000000..bf9682a
--- /dev/null
+++ b/src/com/annimon/ownlang/annotations/Modules.java
@@ -0,0 +1,13 @@
+package com.annimon.ownlang.annotations;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.PACKAGE)
+public @interface Modules {
+
+    Class[] modules();
+}
diff --git a/src/com/annimon/ownlang/lib/Variables.java b/src/com/annimon/ownlang/lib/Variables.java
index c058eda..35ce3ac 100644
--- a/src/com/annimon/ownlang/lib/Variables.java
+++ b/src/com/annimon/ownlang/lib/Variables.java
@@ -41,6 +41,10 @@ public final class Variables {
         scope.variables.put("true", NumberValue.ONE);
         scope.variables.put("false", NumberValue.ZERO);
     }
+
+    public static Map<String, Value> variables() {
+        return scope.variables;
+    }
     
     public static void push() {
         synchronized (lock) {
diff --git a/src/com/annimon/ownlang/lib/modules/package-info.java b/src/com/annimon/ownlang/lib/modules/package-info.java
new file mode 100644
index 0000000..3846917
--- /dev/null
+++ b/src/com/annimon/ownlang/lib/modules/package-info.java
@@ -0,0 +1,16 @@
+@Modules(modules = {
+    canvas.class,
+    canvasfx.class,
+    files.class,
+    functional.class,
+    http.class,
+    json.class,
+    math.class,
+    ounit.class,
+    robot.class,
+    std.class,
+    types.class
+})
+package com.annimon.ownlang.lib.modules;
+
+import com.annimon.ownlang.annotations.Modules;
\ No newline at end of file
diff --git a/src/com/annimon/ownlang/utils/ModulesInfoCreator.java b/src/com/annimon/ownlang/utils/ModulesInfoCreator.java
new file mode 100644
index 0000000..6523d0c
--- /dev/null
+++ b/src/com/annimon/ownlang/utils/ModulesInfoCreator.java
@@ -0,0 +1,91 @@
+package com.annimon.ownlang.utils;
+
+import com.annimon.ownlang.annotations.Modules;
+import com.annimon.ownlang.lib.Functions;
+import com.annimon.ownlang.lib.Types;
+import com.annimon.ownlang.lib.Value;
+import com.annimon.ownlang.lib.Variables;
+import com.annimon.ownlang.lib.modules.Module;
+import java.util.ArrayList;
+import java.util.Comparator;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import org.json.JSONArray;
+import org.json.JSONObject;
+
+public final class ModulesInfoCreator {
+
+    public static void main(String[] args) throws InstantiationException, IllegalAccessException {
+        final Class<Module> clazz = Module.class; // get classloader for package
+
+        final List<ModuleInfo> moduleInfos = new ArrayList<>();
+
+        final Package modulesPackage = Package.getPackage("com.annimon.ownlang.lib.modules");
+        final Modules annotation = modulesPackage.getAnnotation(Modules.class);
+        for (Class moduleClass : annotation.modules()) {
+            Functions.getFunctions().clear();
+            Variables.variables().clear();
+            final Module module = (Module) moduleClass.newInstance();
+            module.init();
+
+            final ModuleInfo moduleInfo = new ModuleInfo(moduleClass.getSimpleName());
+            moduleInfo.functions.addAll(Functions.getFunctions().keySet());
+            moduleInfo.constants.putAll(Variables.variables());
+            moduleInfos.add(moduleInfo);
+        }
+
+        final JSONArray modulesJson = new JSONArray();
+        for (ModuleInfo moduleInfo : moduleInfos) {
+            modulesJson.put(moduleInfo.toJSON());
+        }
+        System.out.println(modulesJson.toString(2));
+
+        System.out.println("Total modules: " + moduleInfos.size());
+        System.out.println("Total functions: " + moduleInfos.stream()
+                .flatMap(m -> m.functions.stream())
+                .count()
+        );
+        System.out.println("Total constants: " + moduleInfos.stream()
+                .flatMap(m -> m.constants.keySet().stream())
+                .count()
+        );
+    }
+
+    static class ModuleInfo {
+        private final String name;
+        List<String> functions;
+        Map<String, Value> constants;
+
+        public ModuleInfo(String name) {
+            this.name = name;
+            functions = new ArrayList<>();
+            constants = new HashMap<>();
+        }
+
+        public JSONArray constantsJSON() {
+            final JSONArray result = new JSONArray();
+            constants.entrySet().stream()
+                    .sorted(Comparator.comparing(e -> e.getKey()))
+                    .forEach(entry -> {
+                final Value value = entry.getValue();
+
+                final JSONObject constant = new JSONObject();
+                constant.put("name", entry.getKey());
+                constant.put("type", value.type());
+                constant.put("typeName", Types.typeToString(value.type()));
+                constant.put("value", value.asString());
+                result.put(constant);
+            });
+            return result;
+        }
+
+        public JSONObject toJSON() {
+            final JSONObject json = new JSONObject();
+            json.put("name", name);
+            json.put("functions", functions.stream().sorted().toArray());
+            json.put("constants", constantsJSON());
+            return json;
+        }
+    }
+}