Add getAvailableWorldGenerators method to WorldManager,

src/main/java/com/onarandombox/MultiverseCore/api/MVWorldManager.java

@@ -158,6 +158,13 @@ public interface MVWorldManager {
      */
     ChunkGenerator getChunkGenerator(String generator, String generatorID, String worldName);
 
+    /**
+     * Get possible generator plugins.
+     *
+     * @return A list of plugin names that is detected to have a chunk generator.
+     */
+    List<String> getAvailableWorldGenerators();
+
     /**
      * Returns a list of all the worlds Multiverse knows about.
      *

src/main/java/com/onarandombox/MultiverseCore/utils/WorldManager.java

@@ -51,6 +51,7 @@ import java.util.Stack;
 import java.util.concurrent.Callable;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.regex.Pattern;
+import java.util.stream.Collectors;
 
 /**
  * Public facing API to add/remove Multiverse worlds.
@@ -104,6 +105,21 @@ public class WorldManager implements MVWorldManager {
         }
     }
 
+    /**
+     * {@inheritDoc}
+     */
+    public List<String> getAvailableWorldGenerators() {
+        return Arrays.stream(Bukkit.getServer().getPluginManager().getPlugins())
+                .filter(Plugin::isEnabled)
+                .filter(plugin -> this.plugin.getUnsafeCallWrapper().wrap(
+                        () -> plugin.getDefaultWorldGenerator("world", ""),
+                        plugin.getName(),
+                        "Get generator"
+                ) != null)
+                .map(plugin -> plugin.getDescription().getName())
+                .collect(Collectors.toList());
+    }
+
     /**
      * {@inheritDoc}
      * @deprecated Use {@link #cloneWorld(String, String)} instead.