Snaptro - Record a video, add links to what you’re working on, and voilà, you have a free Snaptro page!
NumWorks - The graphing calculator that makes learning math easier.
Roob. - Ask your candidates for video resumes, instead of CVs
Learney - Knowledge aggregator for developers
Willo Video Interviewing - Easily interview people remotely on video, for free.
eMathHelp.net - Site is created to help people learn math. Includes algebra, calculus, differential equation calculators and notes with many examples.