DropStop

What is DropStop?

DropStop is a plugin that will allow you to prevent blocks from dropping items when broken. DropStop is light but very flexible. You can configure any world individually and add exceptions. You don't want players picking up cactus blocks. Done. Want them to be able to pickup cactus blocks on a cactus world? Also done. Furthermore, you can prevent block breaks from dropping experience orbs, or only dropping experience orbs. Glorious!

Permissions

Only one permission that is not awarded by default.

dropstop.immune - makes a player immune to the plugin.

Default config.yml

#-----------------------------------------
#      DropStop Configuration File
#-----------------------------------------
#To add a world just enter its name like the examples below.
#To add a block type to the list of exceptions just add it to
#the exceptions list. Be sure to use the all capital material
#name. A list can be found here:
#http://jd.bukkit.org/rb/apidocs/org/bukkit/Material.html

world:
  dropXP: false
  exceptions:

#world_nether:
#  dropXP: false
#  exceptions:
#    - NETHERRACK
#    - NETHER_BRICK

#world_the_end:
#  dropXP: true
#  exceptions:
#    - SOUL_SAND

The default config.yml will prevent all blocks from dropping items in the world named "world."

Source

You can follow this project on GitHub.