OpenWRT does support 802.11r fast roaming for multiple APs.
The problem with OpenWRT is/was the configuration of multiple APs. There is OpenWISP, but they mostly target very large setups (>100 APs).
So I built OpenSOHO using the OpenWISP daemons on the AP and a pocketbase frontend. (https://github.com/rubenbe/opensoho).
No band steering yet unfortunately.
alt Hacker News
OpenWRT does support 802.11r fast roaming for multiple APs. The problem with OpenWRT is/was the configuration of multiple APs. There is OpenWISP, but they mostly target very large setups (>100 APs). So I built OpenSOHO using the OpenWISP daemons on the AP and a pocketbase frontend. (https://github.com/rubenbe/opensoho). No band steering yet unfortunately.