Windows/iOS/Android/Chrome/Firefox: A good VPN is a handy tool. A free, unlimited one is even better. Betternet aims to make using a VPN (as well as my wordplay) dead simple.
Betternet doesn't have any usage limits for its service, and users aren't required to register any personal information in order to sign up. The service doesn't track any user information. 100% of its revenue comes from ads within some of the Betternet apps. You can see a detailed breakdown of the company's costs, as well as its revenue source, here.