MusE is a MIDI/Audio sequencer with recording and editing capabilities written by Werner Schweer. MusE aims to be a complete multitrack virtual studio for Linux
ReText is a simple but powerful text editor for Markdown and reStructuredText.
The world's most advanced browser HTML5 based WYSIWYG editor lets you experience a whole new way of editing. It's faster than existing technologies and offers unprecedented WYSIWYG functionalities.
PiTiVi is an open source video editor, written in Python and based on GStreamer and GTK+.
This module integrates the excellent HTML5 "true WYSIWYG" editor Aloha Editor) with Drupal.