Smultron

For Mac OS X users looking for a powerful open-source text editor, the Cocoa-written option definitely needs to be on your radar. With an impressive feature set that covers most of your needs, you can enjoy a better writing and programming experience with this software.

One of the most noteworthy features that you'll appreciate is the customization options that are available. Whether it's changing the font, color scheme, or layout, you can tweak the editor to your liking. Additionally, the syntax highlighting feature ensures that code is easy on the eyes and easier to work with.

The software's performance is also commendable, with the latest version being fast and responsive. This is crucial when working with large files, as you won't experience any lag or delay. The sleek interface also ensures ease of use, making your writing and editing tasks more streamlined.

Overall, Cocoa-written open-source text editor for Mac OS X is a standout choice in its category. With its robust feature set and user-friendly interface, it's a tool that's sure to get plenty of use from any Mac user who takes writing or programming seriously.