DNSCrypt

DNSCrypt (developed by OpenDNS), though technically a preview release, is an application that encrypts your DNS requests. DNS requests are your computer communicating with a DNS server asking it to translate your human-readable urls into machine-readable urls, for example, duckduckgo.com becomes 50.18.192.250. Encrypting these requests prevents snoopers from knowing what websites you’re visiting, spoofing a url and presenting you with a false page, or from mucking around with your packets in general. This program may accidentally break your connection if it can't access its servers, if you want more reliability, open up the preferences and check the option "fall back on insecure DNS", and yes, this is another install-it-and-forget-it application.

DNSCrypt for Windows & Mac can be downloaded here.