LDAPCP is completely free and open source.
Total downloads: -
Downloads of latest version: -
Query multiple Active Directory and LDAP servers in parallel.
Customize the display of results.
Return group membership (augmentation).
Administrators can configure many settings through PowerShell or administration pages.
LDAPCP can be easily tested by deploying this ARM template in Azure: It creates a full SharePoint farm and configures LDAPCP in a federated scenario between SharePoint on-premises and ADFS.