Mods for Counter-Strike: Global Offensive that you can search for in the monitoring.

ZombiMod

Servers with zombie mods use maps whose name starts with "zm_"
So the link to find zombie mod servers is like this https://www.gs4u.net/en/csgo/search/map-zm_/

 

Maniac

To find servers with the mod "Maniac", you need to search by name.
That's the link to the servers with the maniac mod: https://www.gs4u.net/ru/csgo/search/name-maniac/

 

MINIGAMES

Servers with the MINIGAMES mod use maps whose name starts with "mg".
Therefore, the reference to such servers would be as follows: https://www.gs4u.net/en/csgo/search/map-mg_/