Techloq is $10 a month. If that’s too much for you, may I suggest perhaps speaking to a Rov who can find an anonymous sponsor for you?
If that’s still too much, OpenDNS is free. However, it doesn’t have the subtlety of Techloq and GenTech. Meaning, you either block everything except a small whitelist, or websites are blocked based on category which isn’t perfect and doesn’t block pictures. Personally, I prefer OpenDNS for the computers I do work on and Techloq for personal devices. Because Techloq and GenTech use something called certificate interception which allows someone working there to read all of your passwords and information, even encrypted.