ETS Map Pack:
http://www.ets-clan.co.uk/viewtopic.php?f=32&t=209
Direct link: http://swat4.tk/download/maps/ETS_COOP_Custom_Maps_v5.0_Exclusive.zip
Mega Map Pack:
https://www.moddb.com/games/swat-4/addons/mega-map-pack
Direct link: http://swat4.tk/download/maps/MegaMapPack_v3.0.7z
Small Map Pack:
https://www.moddb.com/games/swat-4/addons/swat4-small-map-pack
Direct link: http://swat4.tk/download/maps/SWAT4_Small_Map_Pack.7z
List of custom maps installed on swat4.tk servers:
http://swat4.tk/maps-on-the-servers/
Map database:
http://swat4.tk/mapdatabase/
Ban list:
http://swat4.tk/db/online_database/banlist.php
In-game server list patch:
https://github.com/sergeii/swat-patches/tree/master/swat4stats-masterserver
Other downloads:
http://swat4.tk/download/
Alternative website address:
http://swat4.epicgamer.org
If the server crashes
for some reason it should automatically restart within 5 minutes.
SWAT4 game server is running on Debian GNU/Linux with Xvfb and Wine32