FlexGamemode Plugin
This Spigot plugin allows players and administrators to change game modes easily using the following commands:
* `/gmc [player]` — Set Creative mode
* `/gms [player]` — Set Survival mode
* `/gma [player]` — Set Adventure mode
* `/gmsp [player]` — Set Spectator mode
* `/gmr` — Reload plugin configuration
Feel free to request/make a push request for adding features.
Check
https://github.com/bedtwL/FlexGamemode/ for more infomation