Don't download this version. TorChat is developed again!
TORChat is an anonymous and encrypted Instant Messenger made by Bernd Kreuß. It's open source, written in Python and it uses the hidden services provided by the TOR network (TOR is not spelled with capital letters nowadays but I prefer it that way to remind me that it is The Onion Router).
The bad thing is that TORChat development stopped before some years and the bundled TOR version works no more. I've packed a version of my own including the latest stable TOR build. Everything is packed with UPX too. You can download my binary version from here. I will try to keep it up to date as new TOR versions come out.
While there is no reason not to trust my version (just decompress my executables with UPX and you'll see they are the same ones with those distributed officially) you might also want to download another nicely packed version from this website.
Oh and my TORChat identity is: 5leg5qw726nluaef