Proxy Desktop Software

You can imagine how important Internet Freedom will be when you are in a country or area where Twitter, Facebook, YouTube and some other websites are blocked, and you have to use proxy tools to visit those websites.
As far as I known, there are 3 kinds of proxy tools which are used to unblock websites:
1. Proxy Desktop Software
You have to download and/or install a proxy software (such as Tor) in your computer.
2. VPN
Some VPN (Virtual Private Network) services also need installation, and some only need to build a Virtual Private Network connection, but most of VPN services are not free.