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It's a router. It's a firewall. It shares Internet access between all the PCs on your network, and -- will you look at that -- it's an Internet proxy as well. Heck, it's everything you've ever wanted between your home systems and the big bad Internet. It's SmoothWall!
OK, granted, it sounds a lot like my first Linksys Etherfast Cable/DSL Router.
Except it's free! Or, it's free if you have an old beater system (a 486 or better will do nicely), a couple of NICs, and the ability to burn a CD. Plus, it's open source, so lots of eyes are making it better every day.
Things to like about SmoothWall
* It recycles a system that might otherwise get tossed into a landfill.
* It's a quick install from its 22MB ISO image.
* It can talk directly to many USB DSL modems.
* It can act as an Internet proxy, storing oft-hit Web information locally.
* It has a simple Web-based interface.
source: techtv.com