+ [`remix-debug`](remix-debug/README.md) allo debuggin transaction.
+ [`remix-tests`](remix-tests/README.md) provides unit testing for solidity.
+ [`remixd`](https://github.com/ethereum/remixd/tree/master) CLI which allow accessing local element from Remix IDE (see https://remix.readthedocs.io/en/latest/tutorial_remixd_filesystem.html)
Each generally has their own npm package and test suite, as well as basic documentation.