Atom is a cool open source editor which is highly customizable through plugins. It has been initially launched by github.
The most powerful plugins are:
- Minimap to provide a Sublime-style overview column next to the text-file
- Remote atom to edit files remotely using ssh
- Change Case - Quickly change cases, camel, upper, snake, file path, .files, ...
- Fonts (afterwards switch to SourceCodePro)