FORM is a Symbolic Manipulation System. Its original author is Jos Vermaseren of Nikhef, the Dutch institute for subatomic physics which is part of the Dutch physics granting agency FOM. Over the years several other people have made contributions. These people are: Albert Retey, Denny Fliegner, Andrei Onyshenko, Markus Frank, Misha Tentyukov and Takahiro Ueda (all at the univertity of Karlsruhe and paid for by the DFG) and Jens Vollinga, Irina Pushkina and Jan Kuipers (all at Nikhef and paid for by FOM). Much systems support has been given by the late Eric Wassenaar and by Ton Damen, both at Nikhef. Organizational support has been provided by Hans Staudenmaier and Hans Kühn (Karlsruhe) and the directors of Nikhef. Many people have put in effort to provide bug reports.
Form is available on the web due to the work of Andries Salm. He compiled the c++ source code to webassembly. That is a computer language which can be run in the browser. Although it runs in a sanboxed envoirment, the speed is proportional to native speeds.