No, not really, but may be interesting anyways.
I’m quite skeptic about the replaceability of AD in Small/Medium Businesses (and sometimes also on large enterprises) when it comes to deal with Windows clients. If the enterprise already runs *nix desktops (or has a strong commitment to go that way, Linux or macOS) or has browser-based OS (cloud, Webtop, etc.) we may talk about different transitional approaches away from AD (LDAP + NFS + CUPS, for example). But if the users are not migrating away from MS on the client side, I think nothing will beat MS itself at integrating features (SSO, shared folders and printers, group policies, security groups for instance).
Or you may try NethServer 7 with SMB4 and native AD 
which to me is one of the (little) alternatives for Enterprise environments that are eligible to be evaluated at least on a technical point of view (just to make some names, if I was allowed to spend money, I would re-evaluate also ClearOS, UCS and Zentyal in this order). But NS Community is free and does its work pretty well, so it would be my first choice (and maybe NS Enterprise as second one).