DD-WRT is free Linux-based firmware for several wireless routers, most notably the Linksys WRT54G.

AOKP (Android Open Kang Project) is an open-source replacement distribution for smartphones and tablet computers based on the Android mobile operating system.

OpenWrt is an embedded operating system based on Linux, primarily used on embedded devices to route network traffic.

Tomato is a small, lean and simple replacement firmware for Linksys' WRT54G/GL/GS, Buffalo WHR-G54S/WHR-HP-G54 and other Broadcom-based routers.