New version of Mebas is out(0.97), the main new feature being the Free for All Mode! Up to for players can play now simultaneously against each other. Just choose the "FFA" mode when creating a game and invite up to 3 friends(or foes) to join the fun!
Teamwork is not supported Yet, but a 2v2 mode is in the works so stay tuned.
Have a look!: Themebas.com