view editor

Unicode keyboard layout editor.

Image viewer/editor.

Markdown editor for Web developers.

GNU Emacs editor for OS X.

Open-source midi tracker/editor.

Subtitles editor

The QuickTime movie metadata editor

ResizeMe is a lightweight, incredibly easy-to-use batch image editor.

video converter, player, editor for MPEG, QuickTime, transport streams, iPod.

Hex editor for huge files.