1. hypixel
Ip is hypixel.net
great server, so many games to choose from. bedwars, counter strike in minecraft, simple pvp, smash bros in minecarft, etc.
2. guncolony
IP is guncolony.com
stunning gunplay and great graphics. its essentially COD in minecraft.
3. moneyfight
i forget the IP
interesting gameplay, centered around money. causes ragequits.
4. cubecraft
pay to win, but fun. forgot IP again
lots of gamemodes