From "Show HN: Skip the SSO Tax, access your user data with OSS" >>35529042 :
glim: https://github.com/doncicuto/glim
"Proxy LDAP to limit scope of access #60" https://github.com/doncicuto/glim/issues/60
glauth: https://github.com/glauth/glauth
slapd-sql: https://linux.die.net/man/5/slapd-sql
gitlab-ce-ldap-sync (PHP) https://github.com/Adambean/gitlab-ce-ldap-sync
Open Source SSO for SMB
ssoready: https://github.com/ssoready/ssoready