Fretta gamemode - more gamemodes?

I tried out the Fretta gamemode for my server, turns out my server host installed it for me.
Anyway, on the F1 menu it say I can choose different gamemodes. BUT, none are listed. Where do I install the gamemodes for Fretta (File location), and does anyone have any cool ones to use?

To “install” a gamemode for fretta, you just have to put it in the gamemodes directory. Most of the good ones are already included with Gmod, but you can search the Gamemodes forum for more releases.