Velix.ID - Frictionless Identity verification through Blockchain
CoinList - Build a diverse portfolio of pre-launch token investments
NoPass.me - Open-source identity verification
Crypto Buyer's Guide - Extensive cryptocurrency buying guide
Amazon Cognito - Amazon Cognito lets you add user sign-up, sign-in, and access control to your web and mobile apps quickly and easily. It scales to millions of users and supports sign-in with social identity providers and enterprise identity providers via SAML 2.0.
CoinCap.io - Shows the prices of different cryptocurrencies from ShapeShift.