The Southwood Serverlist plugin is part of the Southwood ecosystem, which aims to serve as a place for SCP:SL server with less restrictions than the Northwood serverlists.
The other parts of Southwood can be found here:
To get your server on the Southwood list, simply grab the latest release and add the dll file to your plugins folder.
sw_enable: true # Used to disable the server in individual servers.
sw_api: <key> # Used for the upcoming admin dashboard. (Currently here for test purposes)