Unless it was a recent change factorio doesn’t “require” a account. When I host my server I disable verification and my friends who still haven’t bought it are able to join no problems. If server has verification on then they can’t.

Only one I ever tried is whatbox.ca . Been using them for 7+ years. They are great.

Not trying to be mean, and I realize this is piracy community. But if you are at the point where your adding mods to a indie game. Probably time to consider buying it. Clearly it would be worth it.(assuming you can afford it ofc)