Plugin under development, here temporarily will be a bad description of the plugin.

Commands:
/gamemode (player|mode) (mode)
/gmc
/gma
/gmsp
/gms

Perms:
ootgamemode.*
ootgamemode.all
ootgamemode.all.others
ootgamemode.{mode}
ootgamemode.{mode}.others

{mode} = survival/creative/spectator/adventure