Cryptab - Track the top 100 Cryptocurrencies in every new tab
Quantiacs - Earn money by creating trading algorithms in your spare time
Blockchain Demo - Visual demonstration of blockchain technology
State.of.dev - Visualizing the current state of development
Frost - An open API for Blockchain timestamping
Algorithmia - Algorithmia makes applications smarter, by building a community around algorithm development, where state of the art algorithms are always live and accessible to anyone.