NoPickup! The plugin that allows you to NOT pickup items!
You can also do so on other players!
place plugin file into the /plugins directory,
/nopickup - Disables or enables nopickup mode for you!
/nopickup <player> - Disables or enables nopickup mode for a player!
nopickup.nopickup.self - Allows you to do /nopickup mode on yourself.
nopickup.nopickup.other - Allows you to do /noickup mode on others.
nopickup.bypassother - Prevents someone from doing /nopickup other.
nopickup.bypasspermission - Bypasses the above permission.