Mercury is a full featured HTML5 editor. It was built from the ground up to help your team get the most out of content editing in modern browsers.

Squad is a web-based collaborative code editor.

SmartMarkUP is a lightweight and powerful JavaScript library that allows you to turn any textarea into a fancy markup editor. HTML, CSS, XML, Wiki syntax, BBCode or any other desired markup language can be implemented and/or adjusted to your preferences and business needs. SmartMarkUP doesn't depend on any other JavaScript library and can be integrated with any already existing JavaScript library or code.

Bean is a small, easy-to-use word processor (or more precisely, a rich text editor), designed to make writing convenient, efficient and comfortable.

Designed from the ground up specifically for Mac users, Iris provides a powerful, intuitive, and easy-to-use solution for all your photo editing needs.

DrawIt is not your typical image-editor. It does not fill up your window with lots of pallets you don’t use but instead presents with just one simple and clean window.

The first image editor that I've used that has seam carving abilities, interesting to see when Adobe picks up this feature for Photoshop.