Custom Server Listing: http://just-wiped.net/custom-map-rust-servers
Maps Added To Listing Again
In the server listing, the action level got removed and the map is now shown again. Currently we will mostly see the regular Rust maps, but hopefully in the future there will popup more custom maps.
Map Filter Extended
The map filter in the extended search has now an option to filter "Custom Maps". Having that set, only servers with non official maps are shown.
Custom Maps Listing
Also there has been a dedicated page added, showing all custom map servers without region and rating restriction. Since there are only a hand full of servers out there at the moment, those filter would probably hit most of them. Here you find the listing.