Everyone
/sethome, /home, /delhome- Set and travel to your homes
/spawn- Return to spawn
/rtp- Random teleport into the wild
/tpa, /tpahere, /tpaccept- Teleport to and from other players
/msg, /pay- Message and pay other players
/ah- The auction house
/vaults- Your vault storage
/shop, /sell- Buy and sell
/team- Teams
/bounty- Put money on a player's head
/mines- The gambling game
/crates, /warp crate- Crate previews and the crates themselves
/creditshop- Trade Credits for crate keys
/tags, /chatcolor, /glow- Cosmetics
/lifesteal check- Another player's hearts and ban status
/playtime- Your time on the server
Unlocked by rank
Ranked players get portable versions of blocks they would otherwise have to walk to, plus a kit of their own.
/back on death- Warrior and above
/enderchest, /anvil, /hat, /nick, /disposal- Warrior and above
/smithingtable, /stonecutter- Celestial and above
/workbench- Deadliest and above
/repair- Custom
/kit <rank>- Every purchasable rank has its own
The ranks page lists exactly what each one grants, taken from the server's permission database.