I use codiad. I used it with PHP, js and C. Features:
- Support for 40+ languages
Plugin Library
- Error checking & notifications
- Mutliple user support
- Editor screen splitting
- LocalStorage redundancy
- Advanced searching tools
- Smart auto-complete
- Real-Time Collaborative editing
- Over 20 Syntax color themes
- Completely Open-Source
- Easily customized source
- Runs on your own server
- Quick-Download backups
- Maximum editor screen space
- i18n Language Support
http://codiad.com
