Net.thelandofnod.bukkit.plugin is a project mainly written in ..., it's free.
Repository for bukkit plugins developed under my namescape
net.thelandofnod.bukkit.plugin.rdbmscore A MySQL Craftbukkit plugin driver that uses bukkit's native event model as the client-plugin interface.
net.thelandofnod.bukkit.plugin.postoffice A MySQL backed mail and package (item stack) delivery system for Craftbukkit.