I figure these might be popular here.
  1. unblockedproxysites.org
  2. proxydownload.net
  3. proxydownload.org
  4. publicproxylists.net
  5. publicproxylists.org
  6. publicproxies.org
  7. proxyswitcher.net
  8. proxyswitcher.org
  9. socksproxylist.net
  10. socksproxylist.org
  11. schoolproxies.org
  12. proxyserverslist.net
  13. proxyserverslist.org
  14. anonymousproxys.net
  15. anonymousproxys.org