LICENSE4J is described as 'Comprehensive licensing library and license manager that operates on a license server, simplifying the management of software licenses for developers. It provides an easy method for integrating licensing models into Java applications with minimal coding effort' and is an app. There are more than 10 alternatives to LICENSE4J for a variety of platforms, including Windows, Linux, Web-based, SaaS and Mac apps. The best LICENSE4J alternative is Keyforge. It's not free, so if you're looking for a free alternative, you could try Labs64 NetLicensing or Keymint. Other great apps like LICENSE4J are LM-X License Manager, Vyoma LMS, LicenseSpring and Software Protector.