Decree

Commands

CommandDescription
clearspawnpointClears a player's spawnpoint.
daylockDisables the gamerule doDaylightCycle and sets the game to noon.
gamerulepresetSave and load gamerule presets stored on the server (carries over to different worlds).
headGet a player head or get info about one.
healthSet, add, or query the health of an entity.
hungerSet, add, or query the food, saturation, or exhaustion of a player.
nameChange the name of an item or entity.
decree rideA ported version of Bedrock's ride command with more features than Java's .
setownerSet the owner of a pet.
toggledownfallToggles rain.
decree stopAn improved version of the stop command; it takes a optional duration.

Gamerules

GameruleDefaultDescription
doEndermanPickuptureAllow Endermen to pickup blocks.
doEndermanPlacetrueAllow Endermen to place blocks.
itemDespawnAge6000Controls how long it takes for an item to despawn.

Check out the wiki for more info on each command.