SubEthaEdit is a powerful and lean text editor. And it’s the only collaborative one that is a joy to use. By combining the ease of Bonjour with the world’s best text collaboration engine, it makes working together not only possible but even fun.(Official Website)
2. Aptana Studio
The world’s most powerful open-source web development IDE just got better. Rebuilt from the ground-up. It’s now much faster, customizable and includes new features to help you be more productive. (Official Website)
This is an HTML and HEX editor that can manage advanced Perl, Java, PHP etc. as well.
4. Komodo Edit
This is the FOSS version of the Komodo IDE.
This is perhaps the most popular integrated development environment for Java.
TextMate brings Apple’s approach to operating systems into the world of text editors. By bridging UNIX underpinnings and GUI, TextMate cherry-picks the best of both worlds to the benefit of expert scripters and novice users alike. (Official Website)
Scriptly is an extensive Windows freeware code editor for writing HTML and programming with PHP. (Official Website)