BusinessTools offers you a bunch of useful commands which will be added over time. It is useful for everyone, whether you play with friends, or you have a large server.
New Futures:
/gamemode - added "gm" alias and arguments "0/1/2/3" like at old versions
/feed - restores hunger
/heal - restores health
/fly - switch flying in survival mode
/god - no damage in survival mode
And more classical commands! Download plugin and try them!
Also there is config where you can disable any command if you want and change players limit, motd and even server icon!