XTiger is an unix emulator (under X Window) of a TI-92 calculator (Texas instruments). It was originally written by Jonas Minnberg and was closed source. Jonas Minnberg has not worked on XTiger for quite a while and he gave Misha Nasledov the code and permission to GPL it. Read more about Dingux-TI92 v1.1.0 (TI92 emu for Dingoo Linux)