JSONAPI is a plugin for Bukkit that allows you to access data and other information about your server and your players through a simple, yet secure, HTTP API. This allows you to make awesome websites, iPhone apps, and a way for your players to purchase goods online and automatically receive them in game.
However, this plugin won't do all of that by itself. It is simply an API that allows you to assemble the features in a way that makes sense for your needs.
You can find the source code on GitHub at alecgorge/jsonapi. I accept pull requests!
JSONAPI is well documented
A big thanks to YourKit!
YourKit is kindly supporting JSONAPI open source project with its full-featured Java Profiler. YourKit, LLC is the creator of innovative and intelligent tools for profiling Java and .NET applications. Take a look at YourKit's leading software products: YourKit Java Profiler and YourKit .NET Profiler.