Tactical Ops Channel – YouTube channel started in 2015 to keep TO:AOT alive with multiple uploaders. Multiplayer gameplay, mix wars and other videos.
STO Gaming – Home of the .sG` clan with forums and a detailed statistics page with player stats from their popular TO 3.4 server.
Tactical Square – Tactical Ops community website with forums, wiki section and downloads.
TO Matches – New website focused on competitive play, ladders, tournaments etc.
GameTracker – Tactical Ops server list on GameTracker, this list only displays server that have been manually added to the website.
333 Networks – Tactical Ops server list and master server, displays all servers that query to the master server and manually added servers.
TO:AOT Facebook – Facebook page run by some community members. Every now and then some posts & announcements are made on this page.
Die Spielwiese – Website from the old German Spielwiese server. Forums, downloads, tutorials.
ESE Protect – Official website from the ESE Anti Cheat for TO3.5. Downloads, documentations, forum for support etc.
TO Live – German TO website focused on competitive gaming with forums, clan database and a file archive but seems rather abandoned after 2014-2015.
UT Files – File Archive with all Unreal Tournament related files. Since TO is build on UT99 allot of files are compatible on both. (Mutators, mapvotes etc.)
Unreal Admin – Website with lots of information related to Unreal, UT99 and Tactical Ops server configuration and settings.
Old Unreal – Website dedicated purely to the old Unreal and Return to Napali expansion.
UT99 – The biggest and most active Unreal Tournament 99 community, forums and downloads.
TO: Crossfire – A fan made mod inspired by TO:AOT build on Unreal Engine 2 (UT2004). Led by the people behind Tactical Ops and TOST, backed up by a bunch of artists, modellers, mappers and supporters. (Inactive multiplayer)
TO4 – TO4: Tactical Operations brings back those nostalgic feelings you know from the early days of online shooters. Round based fast-action first person shooter with classic controls, built using the Unreal Engine 4. (Still in development)