Useful links for discussion
News
www.startrek.com - The official website for Star Trek
trektoday.com/content/ - An archive of Star Trek news.
Reference
trekcore.com - Star trek images, audio, video and reviews. Huge number of screencaps of every Star Trek episode.
memory-alpha.fandom.com/wiki/Portal:Main - An extensive collaborative Star Trek wiki about ‘canon’ Star Trek (what is seen on-screen).
memory-beta.fandom.com/wiki/Main_Page - Another extensive collaborative wiki about ‘non-canon’ Star Trek (books, comics, games, etc.)
www.ex-astris-scientia.org - Huge compendium on scientific, technical, artistic, social and philosophical aspects of Star Trek.
tvtropes.org/pmwiki/pmwiki.php/…/StarTrek - TV Tropes Star Trek page
www.phasers.net - Everything you ever wanted to know about hand phasers
…fandom.com/…/Explaining_errors_in_Star_Trek_Wiki - Explaining errors in Star Trek wiki
www.st-minutiae.com - As the name suggests, all about the little details in Star Trek
www.startrekmap.com - Star Trek maps
www.shipschematics.net - Sci-Fi ship schematics including Star Trek ships
startreksetplans.tumblr.com - Blueprints from Star Trek sets (not ship schematics, the actual shooting set plans).
roddenberry.x.io - The official Roddenberry archives. 3D navigable ship interiors.
Organizations
www.kli.org - The Klingon Language Institute
sfi.org - Starfleet International, the international fan organization
www.starfleet.center - STARFLEET, the oldest continuously-operating fan organization in the world.
www.trekfederation.com - Charity organization for fans to help with real-world problems.
Please add links below and I will edit this post. I want to avoid things like personal Twitter or Instagram pages from specific actors or this list will get ridiculously long.