If you haven't heard of Halo Online it's a multiplayer only, Halo 3/Halo 4 hybrid for the PC. Currently the game is free to play and still in development. I'm thinking that ZA could migrate over to Halo Online because it has all of the Halo 3 game modes and Forge, so we could customize maps.
Servers are hosted by the players, one player hosts and everyone else joins them. There is a dedicated server version but I haven't seen anyone use one yet (and we would need a dedicated server).
If you are interested, you can find the download (after a little searching) here: www.reddit.com/r/...
The Halo Online Reddit forums are extremely helpful with setting the game up and troubleshooting issues with the game. I hope to see some other ZA members in Halo Online.
Anyways, I'll be playing Halo Online using the [ZA] clan tag on my name.