I personally stopped using TotalTerminal and switched to iTerm2. That is why it I dropped the development for good:
Here is a 5-years old version you could fork off:
Unfortunately, I cannot open-source more recent versions, because I refactored a lot of it to use shared codebase with TotalFinder. And I’m not going to opensource TotalFinder parts: 1) for security reasons 2) for copycat reasons - I’m still selling TotalFinder