The EFF launches a router project

I only used dd-wrt a little bit, but it looked to me like the only thing that it may be suitable for was running an AP, while OpenWRT (and derivatives) are much more general.

configuration for dd-wrt was a registry of name-value pairs while Openwrt uses config files and scripts.

There is also a very large selection of packages available in Openwrt while dd-wrt is just a router.