List of cheapest ether bridge between evm chains and rollups, based on my experience

Note that some of these bridges may in beta or alpha phase and not audited

L1 - Arbitrum = DeGate

L1 - Optimism = Orbiter

L1 - ZkSync = Orbiter

L1 - Polygon = Hop

Arbitrum - Optimism = Hop

Arbitrum - ZkSync = Orbiter

Arbitrum - Polygon = Hop

Optimism - Zksync = Orbiter

Optimism - Polygon = Hop

Polygon - ZkSync = Orbiter

L1 - EVMs = Cbridge or Xpollinate

Rollups - EVMs = Cbridge or Xpollinate

Links: DeGate | Orbiter | Hop | Cbridge | Xpollinate

List of other bridges I've not try yet: Across, Multichain, Movr, deBridge