KoKo

Proxy Bypasser
The majority of the users are people trying to bypass their school or business's filters. Also used to surf the web anonymously.

http://www.xanproxy.be/ - no ads except the first page.
http://ieproxy.com/ - no ads.
http://www.techtakeover.com/search/ - no ads.
http://www.spysurfing.com/ - no ads except front page.
http://www.myfreeproxy.be/ - ads on the front page
http://worldwideproxy.com/ - no ads.
http://www.proxytastic.com/ - contains ads.
http://www.nomorelimits.net/ - contains ads.
http://www.proxifree.com/ - contains ads.
http://browseatwork.com/ - contains ads, but clean looking
http://www.netsack.net/ - clean looking but with popup ads.
http://www.afreeproxy.com/ - contains ads.
http://cgi-proxy.net/ - contains ads on the first page, slow.
http://www.coveredtracks.com/homepage.php - no ads. but rugged site.
http://www.easyproxy.org/ - no ads except the first page.
http://www.privatizer.net/ - contains ads on the first page.
http://www.secure-tunnel.com/ - no ads.
http://www.spiderproxy.com/ - no ads.
http://thestrongestlinks.com/ - contains ads on the first page, slow.
http://www.unipeak.com/ - slow, no ads.
http://betaproxy.com/ - contains ads.
http://proxy7.com/ - contains ads.
http://webwarper.net/ - contains ads.
http://www.chronicpulse.net/ - contains ads.
http://www.space.net.au/~thomas/quickbrowse.html - multiple proxys
http://www.proxyking.net/ - contains ads.
http://w3privacy.com/ - contains ads.
http://freeproxy.us/ - contains ads.
http://www.goproxing.com/ - contains ads.
http://greenrabbit.org/ - contains ads but small ads
http://hujiko.com/ - contains ads.
http://poxy.us.to/ - no ads.
http://hidemyass.com - no ads except front page.
https://proxify.com/ - contains ads.
http://projectbypass.com/ - contains ads and popups.
http://www.proxymouse.com/ - contains huge ads.
http://letsproxy.com - contains ads.
http://www.the-cloak.com/login.html - no ads.

Update:
Thanks to the anonymous poster.

Secure pages and with no ads:

https://www.stday.com/cgi-bin/nph-proxyb.cgi/
https://www1.ft888.net/cgi-bin/nph-proxyb.cgi/
https://www2.ft888.net/cgi-bin/nph-proxyb.cgi/
https://www3.ft888.net/cgi-bin/nph-proxyb.cgi/
https://www.secure-tunnel.com/SafeBar/safebar.cgi/ (also available via http://)
https://www.dongtaiwang.com/cgi-bin/nph-proxyb.cgi/
https://www1.dongtaiwang.com/cgi-bin/nph-proxyb.cgi/
https://www2.dongtaiwang.com/cgi-bin/nph-proxyb.cgi/
https://www3.dongtaiwang.com/cgi-bin/nph-proxyb.cgi/
https://towel.greyfyre.info/proxy/index.php


Insecure pages (mostly no ads):

http://pbkill.com/scgi-bin/nph-proxy.cgi
http://darwin.servehttp.com/cgi-bin/cgiproxy/nph-proxy.cgi
http://www.brainflux.org/cgi-bin/nph-proxy.cgi
http://starkravingmad.org/nph-proxy.cgi/
http://barracuda.tx.envision7.com/~admin46/cgi-bin/nph-ih4x.cgi
http://www.q2r.net/pc/nph-proxy.cgi
http://www.e-ronin.com/cgi-bin/shared/nph-proxy.cgi
http://www.groothuijsen.nl/cgiproxy/nph-proxy.pl/
http://www.vtunnel.com/nph-proxy.pl - with a little ad but still ok.
http://70.84.193.226/nph-86prox.pl
http://www.neoambient.com/86prox/
http://www.ipent.com/ihfc/nwochat/projectshadow/buttons/nph-proxy.cgi/ - contains ads, encodes url.
http://www.q2r.net/pc/nph-proxy.cgi


PHProxies:

http://www.arnit.net/utilities/webproxy/new/ - contains ads on the first page.
http://www.browseany.com/ - contains ads.
http://www.zhaodaola.org/web/ - contains ads.


No Input box by default:

http://www.gouc.fr/cgi-bin/nph-proxy.cgi - no ads, french language.
http://heshan18.com/cgi-bin/nph-proxyb.cgi - no ads.


No images:

http://www.floon.com/cgiproxy/nph-proxy.pl/


Other pages with ads:

http://www.netshaq.com/cgiproxy/nph-proxy.cgi/ - no input box by default
http://www.proxy-surf.com/nph-proxy.pl/
http://www.bywhat.com/ - lots of ads.
http://www.fireprox.com/nph-proxy.pl/ - same as above.
http://www.nethider.com/cgi-bin/nph-proxy.cgi - popups, ads taking half of the browser space.
http://www.safesurfers.net/
http://www.usbm.de/cgi-bin/userbeam.pl/ - popup, ads, no images.
http://proxy.perlproxy.com/p/
http://proxy.cecid.com/p/

Quick update:
http://www.twobeep.com/ - no ads.

Update
Thanks to alex-and-r, RandomC, and an anonymous poster

http://www.guardster.com/ - contains ads.
http://concealme.com - contains ads.
http://www.twobeep.com/ - no ads.

Update:

http://anonymizer.nntime.com/
http://radiofarda.be

Update:
thanks hybridstorm

http://ibypass.org - contains ads. (also available as .com .net .tk)


For corrections, additions, please submit comments. Thanks.