DMU, DME, Jproject, Yu-Gi-Oh! ONLINE: Duel Evolution.
The last one is free for 10 Duels, then you have to pay to get more Duelpasses.
EDIT: There may be more but i don't remember 'em.
- DMA Tag Tournament 1st Place - LDA Moderator - DMA Administrator -
DWA Overlord/Obelisk Blue - LW Member - AFV Assistant Administrator - DK Silver Stardust -