Let players make their own SMP in your server.

Let your server players make their own smp.
In PlayerSMP you can let players have their own SMP. Limit how many SMPs a player can create.
Limit the World size. Player can change gamemodes. Toggle pvp on/off.
1. Download the latest PlayerSMP release jar.
2. Download the latest Multivese-core jar.
3. Drop it into your server's plugins/ folder.
4. Restart the server and you are ready to go!
/psgm creative/survival <PLAYERS NAME>- Sets players to creative or survival/smp create/delete <WORLD NAME> - Creates and deletes the smp world/smp join <WORLD NAME> or <PLAYER NAME> - Joining a SMP/smp leave - Leaving an SMP/smp invite/uninvite - Invites and uninvites players to a private smp /smp open/close - Open and close a SMP to public /smp info - Information about the SMP
max-worlds-per-player - Limits how many worlds a player can make
max-worlds-total - Limits how many worlds a server can have
worlds-root SMPWORLDS - Saves SMPs world in this folder
use-symlinks - Links the SMPWORLDS folder to servers root
default-pvp - Pvp enabled in default
world-border-enabled - Enables Borders to the world
world-border-diameter - How many blocks in diameter long
world-border-warning - Warns player when they are near the border. per block