Fletcher wrote If you want to browse in privacy you can just use Tor Browser instead of trying to find a reliable free VPN. If you really are set upon using an external VPN though you can use Tunnelblick or can use a free trial for HotspotShield. If you are in the UK its worth noting there is a free service called UKIPVPN, so you could check that out too.

Oh yeah and that... i forgot about TOR..

check it out here
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Dont use Tor for logging into personal accounts, Paypal, Facebook etc you never know who will receive it.
Also never go onto the special side of the web accessible and click random links.. Very bad idea..

Cyber Ghost is good and I used to use it although it stopped working for me for some reason so now I use Hotspot Shield which seems pretty good although it's not the best.