http://moq7aejnf4xk5k2bkaltli3ftkhusy2mbrd3pj23nrca343ku2mgk4yd.onion/about
It had a keyboard trainer, a simple text editor, calculator, G-BASIC and F-BASIC, also had classic russian music like Moscow Nights in 8-bit. Despite having BASIC on that cartridge I had no opportunity to start programming because I didn't have a manual. Anyway, I read that there was just code examples and most of them didn't work, LOL.