Welcome back!
Well, first of all, there's Trespasser CE, which is sort of the successor to ATX. As for maps... well, there have been several over the years since ATX and CE wer released.
Maybe the quickest way to find out is to watch the playthrough videos that have been released since then, or just check the list at the downloads section:
https://www.trescom.org/download-category/levels/Not sure if everything's there... sometimes when someone released a level, it was at a time when the TresCom server was under maintenance and we couldn't mirror it locally, and may have forgotten to add it later. Hopefully we aren't missing any by now.
Have fun!
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Visit
The Carnivores Saga - a forum devoted to modding Action Forms'
Carnivores,
Carnivores 2 and
Carnivores: Ice Age games
Tres WIP: updated
T-Script Reference and
File Formats documents
Sound name listings for the
Demo (build 117),
Retail (build 116),
Beta 103,
Beta 99,
Beta 97,
Beta 96,
Build 55,
PC Gamer Alpha (build 32) and
E3 1998 Alpha (build 22) TPA files