Fedora 20 includes the WildFly 8 Application Server, formerly known as the JBoss Application Server, a very popular Java EE platform. WildFly is a very fast, modular and lightweight server. WildFly makes it easy to run and manage cluster of servers with many applications deployed.
Fedora 20 includes version 4.0 of the popular Ruby on Rails web framework. This latest release includes improved functionality, speed, and security in addition to better modularization.
Developers moving to Ruby on Rails 4.0 can find assistance from the project's upgrade guide and detailed information in the upstream Release Notes.