Freeform-J

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FreeForm-J is a GUI form editor that comes with the Just BASIC programming language. Originally written by Carl Gundel, it has been taken over as a community project. This is possible because it is written in Just BASIC, and the source code is included with each copy of Just BASIC. Because of this, FreeForm-J could be modified to produce GUI code for other languages such as Java, for example.