I’m looking for a WLAN router that runs only free/libre software. It doesn’t need to contain a modem.
ThinkPenguin.com offered the Free Software Wireless-N Broadband Router for GNU / Linux (TPE-NWIFIROUTER2), which even got FSF’s RYF certification, but it’s "no longer for sale/available".
I would prefer a router that ships without any proprietary software, but if there isn’t one, I’m fine with a router that ships with proprietary software, as long as a free/libre OS (and free/libre firmware) can be installed without voiding the warranty, ideally officially supported.