Rosettanet is a middleware aiming to provide a simple and efficient way to interact with Starknet from Ethereum based libraries and applications.
The contracts are located in the contracts/ directory. It's a scarb project, so you can use the scarb CLI to build it.
It uses Starknet Foundry for tests.
See the contracts README for more information.
See the RPC README for more information.
Here is a high-level overview of the architecture of Rosettanet:

