m0n0wall is a project aimed at creating a complete, embedded firewall software package that, when used together with an embedded PC, provides all the important features of commercial firewall boxes (including ease of use) at a fraction of the price (free software). m0n0wall is based on a bare-bones version of FreeBSD, along with a web server, PHP and a few other utilities. The entire system configuration is stored in one single XML text file to keep things transparent.

m0n0wall is probably the first UNIX system that has its boot-time configuration done with PHP, rather than the usual shell scripts, and that has the entire system configuration stored in XML format.

m0n0wall is targeted at embedded x86-based PCs.

The recommended amount of RAM for m0n0wall is 64 MB. It might work with less, especially if you don't use a lot of features/services, but there are no guarantees about that - watch out for failing firmware uploads (m0n0wall does not use swap space, so it can't do anything about running out of memory).