The JBoss Enterprise Application Platform (or JBoss EAP) is a subscription-based/open-source Java EE-based application server runtime platform used for building, deploying, and hosting highly-transactional Java applications and services developed and maintained by Red Hat.
[1] The JBoss Enterprise Application Platform is part of Red Hat's Enterprise Middleware portfolio of software.
[2] Because it is Java-based, the JBoss application server operates across platforms; it is usable on any operating system that supports Java.
JBoss itself is free and open-source, but Red Hat charges to provide a support subscription for JBoss Enterprise Middleware.
These products are part of the JBoss Enterprise Middleware portfolio of software,[2] or are included with the JBoss Enterprise Application Platform software.