An extremely unfair Tetrinet bot that will annihilate any competitor in a (configurably) short span of time. Trash-talk included.
The software
GNU GPL v3. One release: source code. More features were planned — scrolling arbitrary text across the field, an interactive version of the bot — but at minimum it's a working example of how to write a Tetrinet bot. If you build on it, I'd like to hear about it.
License
GNU GPL v3.