Invision - Prototyping and collaboration for design teams
Commandline Challenge - Test your command line skills
Axure RP - The prototyping and specification software used by 87% of the Fortune 100. Beyond mockups, design interactive prototypes for business solutions, websites, and applications.
Prompt - Prompt provides fully-integrated writing education solutions, combining instruction, curriculum, and feedback. We support educational institutions, companies, and individuals.
UXpin - Design is really about solving problems. UXPin is the UX Design Platform that gets that right.
Cwiki - A Command line interface for searching Wikipedia!