Some Snapshot voting strategies require significant computation and are only available to Snapshot Pro spaces: https://snapshot.box/#/pro. These are called premium voting strategies.
List of premium strategies
aura-vlaura-vebal-with-overrides
balance-of-with-linear-vesting-power
balancer-delegation
cyberkongz
cyberkongz-v2
delegation
delegation-with-cap
delegation-with-overrides
erc20-balance-of-delegation
erc20-balance-of-fixed-total
erc20-balance-of-quadratic-delegation
erc20-votes-with-override
esd-delegation
ocean-dao-brightid
orbs-network-delegation
api-v2-override
rocketpool-node-operator-delegate-v8
eden-online-override
split-delegation
sonic-staked-balance
Migrating from "delegation" to "with-delegation" strategy
If you are currently using the delegation strategy and want to move to a non-overriding alternative, see this article: