The Cobalt Qube3 is a nice little box that runs Linux (kernel 2.2.16, IIRC) and works as a web/mail/file/print server (SMB, AppleShare and NFS), firewall and VPN client/server (supports IPSec and PPTP)
Resources:
- Source Code
- ROM Resources
- Sausalito UI Resources, CCE
- ROM Updates
- Online Demo
- Pkgmaster - Third-party packages with enhancements and updates, like SSH, mySQL and XFree86.