FireDragon from Garuda.

Oh it has dual partitions for kernel which makes it easy to recover from an error.

https://www.reddit.com/r/openwrt/comments/1fgta78/guide_to_installing_openwrt_on_the_20_linksys/

I'd argue the Linksys LN1301 (mx4300) already suites this purpose better than the "one". If you can find it for the same price or less I'd grab one. Comes with 2GB ram, 1 GB flash and was being sold cheap ($25) from woot and amazon because the deal the hardware was intended for fell through. Does mesh, has usb 3.0 etc.

Openwrt snapshots are available but it's not yet in the mainline source. I replaced a $90 asus router with one and have been very pleased.

First off...I'm a linux ONLY user on my desktop but I'll be the first to admit right now windows mobile gives you the MOST bang for your buck on the pocketpc type phones...most software available etc....with custom roms available on many sites you can basically make the phone do anything you want. That doesn't mean I'm not eagerly awaiting linux for my phone via android or another method but it will still be quite a while until the software base is able to compete with windows mobile.

This was exactly the same case with linux vs windows on the desktop initially.