Lugdunon is described as 'Entirely moddable MMO in which YOU shape the world you want to play in! Run your own server and forge your own continent from the sea. Create creatures with the built in NPC editing tool. Define your own skills, achievements, and items' and is a game development tool in the development category. There are four alternatives to Lugdunon for Mac, Windows, Linux and Steam. The best Lugdunon alternative is RPG Maker. It's not free, so if you're looking for a free alternative, you could try RPG Paper Maker or Open RPG Maker.