TICT is a group of people that are famous for creating many assembly programs for the TI-89/TI-92(+).
Founded by Thomas Nussbaumer, TICT has evolved from a guy creating a chess program into a group of programmers that have made such famous programs like the E-Book reader, a set of C++ tools for the calcualtors, and even a 3D-programming environment (FAT) that in the future will be the engine for Wolfenstein 3D on the TI-89/TI-92(+).
On a side note: With great shock to the calculator programming world, on April 20th Thomas resigned from TICT. Luckily, he has left the group intact, but he will be greatly missed.