Pingendo : The simplest app for Bootstrap prototyping. Create quality HTML prototypes quickly, using popular open source tools like Bootstrap, LESS, Fontawesome ...
Arora : Arora is a lightweight cross-platform web browser. It's free (as in free speech and free beer). Arora runs on Linux, embedded Linux, FreeBSD, Mac OS X...
QtWeb Internet Browser : QtWeb is a fast, lightweight and portable browser with some unique UI and privacy features. QtWeb is an open source project based on Nokia's Qt framew...
Opentape : Opentape is a free, open-source package that lets you make and host your own mixtapes on the web.
Upload songs (via web or FTP), reorder, rename, cust...
Origami Studio : Origami is a free tool for designing modern user interfaces.
Wireframing, mockups and prototyping for websites and applications