Free, Open Source, User-Mode SMB 1.0/CIFS, SMB 2.0, SMB 2.1 and SMB 3.0 server and client library
TalAloni/SMBLibrary has 883 GitHub stars.
It currently ranks #13947 daily, #14927 weekly, #18156 monthly by momentum on Trending Repos; its best-ever rank is #5632.