LDAP-Sync can sync entries from a remote LDAP server to your phone's Contacts, making them available offline. They are then accessible to all apps with permission to read your address book. It works read-only and never changes data on the remote server.
Downloads are available from F-Droid and Play Store.
Find some explanations on how to use the app and how to generate configuration templates on the documentation page.
After an initial pull, open the project in Android Studio. To build an APK, use the Build > Generate Signed APK ... command.
The original source is hosted at https://github.com/weisserd/LDAP-Sync. An updated fork is hosted at https://github.com/max-weller/LDAP-Sync
This project is licensed under the Apache License v2.0.