L++ is a Lemmings Clone meant for online multiplayer.  It is similar to Cheapo Copycat Lemmings as far as customization goes, but not exactly as flexible.  It contains the classic skills, plus a few skills from Lemmings 2: The Tribes.  A skill from All New World of Lemmings (Lemmings 3) is also included.  These skills include:

L++ also contains a built in level editor.