I was wondering if anyone was using or had tested Freemember with the new EE 3.x ? I'm working on upgrading some sites and I used this in a few of them. Thanks!
Freemember has not been updated to be compatible with EE3 - you'd have to contact DevDemon and ask if they have plans. (It doesn't appear in their EE3 roadmap, and as a free add-on that was Adrian's baby before he sold Expresso Dev to DevDemon, it may not happen.)
But it's open source, so anyone can tackle the conversion ad make a pull request.