KDE Advanced Text Editor
Kate is a multi document editor, based on a rewritten version of the kwrite editing widget of KDE, offering all the features of that plus a bunch of its own.
Some of the Kate application features are:
- MDI, window splitting, window tabbing
- Spell checking
- CR, CRLF, LF newline support
- Encoding support (utf-8, utf-16, ascii etc.)
- Encoding conversion
- Regular expression based find & replace
- Powerfull syntax highlighting and bracket matching
- Code and text folding
- Infinite undo/redo support
- Block selection mode
- Auto indentation
- Auto completion support
- Shell integration
- Wide protocol support (http, ftp, ssh, webdav etc.)
- Plugin architecture for the application and editor component
- Customizable shortcuts
- Integrated command line
- Full DCOP scripting
- Scriptable using JavaScript (KDE 3.5)



Most of my day to day programming work is done using Kate. I find it the best of the all purpose Linux text editors. Plenty of good features, but occasionally does strange things with indenting. Otherwise very stable.