Scratch is a high-level, block-based visual programming language and website designed mainly as an educational tool for children, especially those aged 8 to 16. It allows users to create projects using a block-style interface, available to use for free.
Contra is a slick app for voicing your most honest opinions. It's pretty simple; you pose a two-sided question and get thoughtful responses and votes from people all around the world. Be careful though: it gets suuuuppper addicting because of the debate mechanism. I've personally spent a few too many hours on it, just trying to prove my point!
TigerTalk makes getting feedback on presentations easy. Share recordings with a click to get time-stamped feedback from anyone, and generate a transcript with analytics on filler words, pausing, and pace.