OpenDS

OpenDS is a Java-written, open source LDAP directory server that impresses with its compliance with LDAPv3 server standards. It also supports a range of standard and experimental LDAP schema and extensions.

One of the most significant benefits of the OpenDS server is its support for a multi-master replication model, ensuring data high availability regardless of operations, updates or searches. This guarantees that your data is always accessible when you need it, making it handy for critical applications.

Additionally, the OpenDS server boasts a limited footprint, making it perfect for integration with other Java applications or web applications. You can embed the server within your application without worrying about added baggage—this significantly increases convenience and enhances the software's practicality.

Overall, the OpenDS directory server is a fantastic choice for your LDAP needs. Its compliance with LDAPv3 standards, support for schema and extensions, and replication model make it a top contender for your business needs. It's also lightweight and effortless to embed into other applications, making it suitable for any business' tech stack.