Admin4 is described as 'tool for server maintenance via several plugin modules, running on Windows, Mac OSX, Linux and many more platforms. Currently, plugins for BIND DNS, LDAP, IMAP and PostgreSQL are included'. There are four alternatives to Admin4 for Self-Hosted solutions, BSD, Linux and Online / Web-based. The best alternative is Webmin, which is both free and Open Source. Other great apps like Admin4 are Atomia DNS (Free, Open Source), facileManager (Free, Open Source) and ProBIND (Free, Open Source).
ProBIND is meant to be a time-saving tool for busy administrators, aiding in managing the configuration of DNS zones across multiple servers. It is intended for use by those already familiar with the components of a DNS zone file and who understand DNS concepts and methods.