There are 5 repositories under emacs-mode topic.
A CIDER extension that provides powerful commands for refactoring Clojure code.
Emacs support for Apple's Swift programming language.
Live coding in Python with PyCharm, Emacs, Sublime Text, or even a browser
OrgMsg is a GNU/Emacs global minor mode mixing up Org mode and Message mode to compose and reply to emails in a Outlook HTML friendly style.
The official solidity-mode for EMACS
Org Novelist is a system for writing novel-length fiction using Emacs Org mode.
Emacs integration for PureScript's psc-ide tool.
An emacs mode for editing Zettelkasten notes with neuron
webpaste.el can paste whole buffers or parts of buffers to several pastebin-like services and supports failover if one service fails.
GNU/Emacs mode that setup local Go playground for code snippets like play.golang.org or even better :)
A groovy major mode, grails minor mode, and a groovy inferior mode.
Emacs global minor mode to highlight thing under point.
Edit LaTeX fragments like editing src blocks
Guide to Markdown Mode for Emacs
GNU/Emacs mode that setup local playground for code snippets in Rust language.
PDFGrep is a GNU/Emacs module providing grep comparable facilities but for PDF files
A GNU Emacs major mode for editing BNF grammars