OtherDrops is a plugin for the Minecraft Bukkit API that lets you completely customize what blocks and dead mobs drop when they are destroyed. Apples from leaves, no more broken glass, and much, much more.
Please see the project page for full details here: http://dev.bukkit.org/server-mods/otherdrops/
These instructions assume you have already forked and/or cloned the project and have on your computer.
Rename version.properties.rename_me to version.properties and adjust the version numbers appropriately (see inside the file for more details).
OtherDrops comes with most dependencies already stored in the repository (for simplicity) however
you need to download a Bukkit build and place into the lib folder - rename it to bukkit.jar
Then build using your IDE or:
$ ant build
Use ant -p to see a complete list of Ant tasks.
Style guide and overview of coding structure is here: https://github.com/Zarius/Bukkit-OtherBlocks/wiki/Coding-guide.