The Terpstra Keyboard WebApp was designed by Siemen Terpstra in the late 1980s.
The WebApp was developed and modified by James Fenn, Brandon Lewis, Bo Constantinsen, and Chengu Wang.
It includes contributions from Scott Thompson and Dr. Ozan Yarman.
The app is available as Free/Libre and Open Source Software under the GPL-3.0 license.
The current version is 1.5.2, which was maintained from January 2015 to May 2019.
Users are encouraged to participate in the development and improvement of the software via GitHub.
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