We've been working to make our own custom mini games. With the latest update came some changes to how command blocks operate so we're trying to get everything back to normal, but otherwise we have running or are working on the following games:

Spleef - With a custom command block operated scoreboard and re settable arena
7 Minutes to Cry - A zombie survival game
GoBoats - A Racing game where you compete with boats on an indoor track made of ice
Boats - where you compete to shoot another teams targets while on an indoor ice rink for boats.
2 different archery ranges, one with re-settable targets and different game modes

Were also working on a Monopoly board game players can try with their friends as well as some different PVP & 'laser tag' style games, as well as many more in the works.