UltraSurf is a freeware Internet censorship circumvention product. The software enables its users to bypass Internet censorship and firewalls using an HTTP proxy server, and employs encryption protocols for privacy. Developed by UltraReach
License: Free
Calypso is a paid VPN service offering advanced encryption and a no-logs policy, making it ideal for privacy-conscious users. UltraSurf, on the other hand, is a free tool that focuses on bypassing geo-restrictions but may have limited privacy features.