CygnusEd
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CygnusEd is a text editor for the Amiga OS. It was developed in 1986-1987 by Bruce Dawson, Colin Fox and Steve LaRocque who were working for CygnusSoft Software. It was the first Amiga text editor with an undo/redo feature. Many Amiga programmers grew up with CygnusEd and a considerable part of the Amiga software library was created with CygnusEd.