HAproxy, is a GPLv2 tcp and http proxy server software written in C. It's used by some big sites. Conveniently, if you need a reverse proxy, you should also be able to use a load balancer, and balance whenever you want as well.
Here some samples of folks using HAproxy as a reverse proxy:
- Sparse notes http://steven.4bits.eu/2010/07/using-haproxy-as-reverse-proxy.html
- Both for Centos/Redhat and Debian/Ubuntu http://www.yourhowto.net/how-to-install-haproxy-as-a-reverse-proxy/
Reverse Proxy for Docker (ooo new hotness) http://oskarhane.com/haproxy-as-a-static-reverse-proxy-for-docker-containers/
It is also possible to use HAProxy as a reverse proxy for IPv6 clients as a buffer with IPv4 services (e.g. a webserver):
- Original tutorial http://www.koopman.me/2011/02/haproxy-for-ipv6-translation-to-ipv4-only-website/
- Local curriculum based on original ^ ;) http://samsclass.info/ipv6/proj/proj-L2.html