Hello. If anyone wants to talk about Halo Map Design, come join the discord channel: https://discord.gg/011cIgIZY5xq4bwSr. I look forward to seeing you there!
http://www.nexusmods.com/halo/ for mod publishing.
I am working on getting synchronizations to work with Relay, which is a tool included with my Zeus program for Windows (and later for OS X) which is a general Halo editing and utility program. I can share a download link to this afterwards.