Psiphon --- Free and open-source Internet censorship circumvention tool for Windows and Mobile

Psiphon is a free and open-source Internet censorship circumvention tool for Windows and mobile phones. If you're using public WiFi or if your Internet is censored, you can use Psiphon to surf securely and bypassing censorship. Psiphon utilizes a combination of VPN, SSH and HTTP Proxy technology to provide you with free and uncensored access to online content.

Psiphon features "Trust, Speed, Simplicity", so it is very easy to use --- just download, click and run, and the connection speed is fine. However, Psiphon is centrally managed and "does not increase your online privacy, and should not be considered or used as an online security tool" (You should try Tor or I2P instead). Besides, it is only available on Windows, Android and iOS.

Links:
https://psiphon.ca
https://www.psiphon3.com
get@psiphon3.com (request to have Psiphon sent to you via email)
https://bitbucket.org/psiphon/psiphon-circumvention-system (source code)