/heal Heals you
/heal all Heals every player
/heal playername Heals a specific player
/feed Feeds you
/feed all Feeds every player
/feed playername Feeds a specific player
/feal Feeds and heals you
/feal all Feeds and heals every player
/feal playername Feeds and heals a specific player
/healthmod Used to add or remove hearts
/god Toggles invulnerability
/god playername Toggles invulnerability to a specific player
/siphon Toggles healing to full health once you kill a player
/healonjoin or /healonj Toggles automatically heals players with the right permissions once the join your server.
/nohunger or /stophunger Toggles hunger loss for the player executing the command