Since it's an open-source project, you can download the Tor Browser and use it completely for free. The Tor network is also based on volunteers, as the whole solution is community-driven...
Download Tor Browser to experience real private browsing without tracking, surveillance, or censorship. Anonymity Online | Defend yourself against tracking and surveillance. Circumvent censorship.
Tor Browser will block browser plugins such as Flash, RealPlayer, QuickTime, and others: they can be manipulated into revealing your IP address. We do not recommend installing additional add-ons or plugins into Tor Browser. Plugins or addons may bypass To
