TokenFactory (V1)
The original launch contract. Used an exponential bonding curve and finalized to Uniswap V2.
Tokens launched on this contract still trade through their original Uniswap V2 pair after they bonded.
Early V4 Hook (transitional)
A short lived Uniswap V4 hook that shipped between V1 and the current V2. A small number of tokens launched here. It is still queryable.
For docs purposes this is grouped under V1 since it predates the current V2 hook.