RuviEdit

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 RuviEdit is an open source Ruby-only editor that runs on Windows/Mac?/Linux?.

 Author:    Vivisuke
 Homepage:  http://vivi.dyndns.org/RuviEdit/index.php
 Family:    -
 Platform:  Windows, Mac OS/X, Linux
 License:   Common Development and Distribution License

Features:

Syntax highlighting,
completion,
real-time syntax error checking,
direct execution, etc.
It allows you to edit Ruby source easily and quickly.

Author talks about license: I hate the GPL system that insists that it is free and free even though it is extremely inconvenient for a programmer、 The license for the RuviEdit development version is the Common Development and Distribution License (CDDL). Although it is no guarantee and no support, it is available free of charge, and it is possible to divert the source code even in a commercial application. (If the source code is diverted, the copyright of the diversion part-the license is still that of RuviEdit） Because CDDL is a GPL-incompatible license, GPL-based projects cannot use the source of RuviEdit.

 Screenshot: