Eric is a full featured Python and Ruby editor and IDE, written in Python. It is based on the cross platform Qt GUI toolkit, integrating the highly flexible Scintilla editor control. It is designed to be usable as an everyday quick and dirty editor as well as being usable as a professional project management tool, integrating many advanced features that Python offers the professional coder. Eric includes a plug-in system, which allows easy extension of the IDE functionality with plug-ins downloadable from the net. Current stable versions are Eric4 based on Qt4 and Python 2 and Eric5 based on Python 3 and Qt4.
Mondrian is a project manager and editor for the Ruby language. It has the familiar look and feel of a modern IDE while remaining dedicated to the uniqueness of the Ruby language and its community. It comes with a dynamic object browser, a full-featured project manager, and does runtime error integration amd syntax highlighting.
Arachno Ruby IDE is a development environment with an Emacs-like editor, an integrated very fast GUI debugger, source code browsing, live syntax checking, a local Apache environment for developing/debugging CGIs and integrated FTP, and a GNU diff frontend. The debugger offers an easy way to debug CGI and ERuby Web applications. It runs on Windows 2000 and XP, SuSE Linux 9.1/9.2, and other 2.6 kernel Linux distributions.