Third Party Supplements

Balanced Map Generator: 
https://ti4-map-generator.derekpeterson.ca/
Game Assistant (turn tracker):
https://ti-assistant.com 
http://extraboard.net/extracomputer
Milty Draft Generator/Assistant:
https://milty.shenanigans.be
Battle Calculator:
http://alphamou.se/ti4calc/
House Rules: 
https://www.reddit.com/r/twilightimperium/wiki/rules
Unofficial Expansion "Discordant Stars":
Board Game Geek description post
Google Drive of all Discordant Stars content (fan-made, full content free to download)