During highschool me and my friend hosted Minecraft server called Craft-Life, for which I've did development. Server had a few iterations, for which I've made custom plugins and developed web services. We also had donation system for players, which granted them features in game. It was quite popular, having more than 200 players online during the peak of its popularity.

A couple of those plugins I've also released as Open-Source-Software:

• PlayerViser provided extensive logging for player actions
• MuteMan let you timeout players in chat and filter language using REGEXes
• HomeMan is a player spawn & teleport manager, which let players teleport to their set locations