Of course, FreeVPN.ninja, and VPNBook are both good VPN providers, and are both 100% free. You don't need to install any software to use them, since they both support PPTP (although installing OpenVPN is still a good idea, since PPTP's encryption is ancient), and both claim to not log their users' activities. No proprietary web browser required.
PS: if you need a third-party DNS, as seems to be the case when on GNU/Linux machines that manage OpenVPN connections with older versions of network-manager, you can go here for a DNS server that also claims not to log users. I assume it doesn't matter if the DNS server logs users, since they are hidden behind a VPN anyway, but for me it's the principle of the matter.