TFX was one of the precursor combat flight simulators that helped to define the standards of modern combat flight simulators, together with Tornado, F14 Fleet Defender and the Falcon series. TFX was programmed by the British company Digital Image Design and published by Ocean Software in 1993.
Source: Wikipedia, "http://en.wikipedia.org/wiki/TFX_%28video_game", available under the CC-BY-SA License.
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Digital Image Design also produced the spiritual successors to TFX, notably EF-2000, F-22 Air Dominance Fighter, and F-22 Total Air War.