Introducing ZAL
The Abstraction Layer for Zimbra
ZAL is the library that provides an Abstraction Layer for Zimbra Collaboration Server, allowing anyone to write highly maintainable Zimbra extensions that will run on any Zimbra server, regardless of the version.
ZAL is Open Source Software released under GNU GPLv2 - so that any developer is able to interface its software with Zimbra through it in a completely version-independent way.
general developers end users