The Lux Programming Language
A Git porcelain inside Emacs
The Clojure Interactive Development Environment that Rocks for Emacs
Emacs client/library for the language server protocol
Emacs major mode for managing jekyll
IDE for Opscode Chef (and ruby) development
Emacs minor mode that provides enhanced tags lookup for Java code.
Short and sweet LISP editing
Emacs plugin for source code indexing of modern Fortran