The Sablier Virtual Machine (SabVM) is a fork of REVM with Native Tokens implemented as precompiles. Native Tokens are like ERC-20, but their balances is tracked by the VM state instead of the contract storage. This allows for more efficient token transfers and interactions.
SabVM was part of the Sablier Mainnet project, which was discontinued in October 2024. You can read the post-mortem here.