Simple to use /rankup plugin for minecraft.
Supports signs.
To create a rankup sign you need the permission enderrankup.sign or just enderrankup.admin.
First you place the sign and type this in the first line: [rankup] and then woola it's finished.
There are only 2 commands at the moment.
/rankup - To rankup to the next rank. Permission: enderrankup.rankup
/rankup reload - To reload the configs. Permission: enderrankup.reload