[Galaco]

A Steam dedicated Source Engine game server push notification service: https://ikamu.io

It’s been live and running for 6 months but generates no revenue, and has only a few users. It has monetised features, but no payment or subscription mechanism.

You add your favourite server ip addresses, favourite map names, then you get push notifications whenever any of those servers starts playing any of those maps.

I created it specifically to watch all Zombie Escape servers in CS:S and CS:GO so that I could play whenever servers started playing my own maps in order to record and gather feedback for improvements. Nowadays though, It’s really only useful for some custom game modes on Garrys Mod, Counterstrike Source and Counterstrike Global Offensive (such as Zombie Escape, TTT, Zombie Survival) as they have large map pools, and each play can last for up to several hours.