Plugins

Plugins are part of mostly every server and provide different game modes, challenges, additional shops, or helpful commands. In general that are modifications which only add contents to the game, but don't change/add blocks nor items nor entities.

The first plugin for phychi.com was Essentials (by Antonio), the second WorldEdit (by Antonio, too)

If you want to create your own plugin or mod, look into my mods/plugins, into the game source code, or the API