Jq mode is an Emacs major mode for editing jq-scripts.

Xcscope is an Emacs interface to Cscope, the source cross-referencing tool.

enh-ruby-mode is a major mode providing syntax highlighting, navigation and indentation capabilities for editing Ruby source files. It parses the source files using Ruby's builtin Ripper class and performs syntax checks on them.

This package adds support for working with Racket code blocks with Org Babel in Org mode.

This package provides commands to quickly switch between shell buffers.

The Internet Engineering Task Force (IETF) and the Internet Society (ISOC) publish various Internet-related protocols and specifications as "Request for Comments" (RFC) documents and Internet Standard (STD) documents. RFCs and STDs are published in a simple text form. This package provides an Emacs major mode, rfcview-mode, which makes it more pleasant to read these documents in Emacs. It prettifies the text and adds hyperlinks/menus for easier navigation. It also provides functions for browsing the index of RFC documents and fetching them from remote servers or local directories.

This package defines a minor mode for distraction-free writing. Some of the default effects include entering fullscreen, deleting other windows of the current frame, disabling the mode line, and adding margins to the buffer that restrict the text width to 80 characters.

This package provides integration between LSP mode and treemacs, and implementation of treeview controls using treemacs as a tree renderer.

Bookmarks are a powerful Emacs feature. This package makes them even more versatile. You can bookmark many more kinds of data. You can add tags. There are many more ways to organize and display your bookmarks. I recommend reading the extensive documentation about BookmarkPlus on the Emacs Wiki.

This library provide one function to show tooltip near the cursor.

pdd provides a library for HTTP requests and asynchronous operations in Emacs. It featuring a single, consistent API that works identically across different backends, maximizing code portability and simplifying development.

There is a semantic way of using tab characters in source code: tabs for indentation, spaces for alignment. This package provides a minor mode which improves Emacs' auto-indenting so that pressing TAB inserts the correct mix of tabs and spaces to maintain visual alignment regardless of a viewer's tab width. You can still use all spaces if you prefer; the code merely ensures that if you enable tabs, the tab size does not matter.

Manage your contacts from Org mode. You can auto complete email addresses, export contacts to a vCard file, put birthdays in your Org Agenda, and more.

Khardel provide an Emacs integration with Khard, a console application to search and edit contacts in vCard format.

This package integrates sxiv into Dired. It adds a command to start sxiv from a Dired buffer, allowing you to mark or unmark image files in said buffer using sxiv.

Ox-html-stable-ids is an Org export extension package that generates HTML with stable ID attributes instead of the random IDs Org's exporter uses by default.

pcre2el or rxt (RegeXp Translator or RegeXp Tools) is a utility for working with regular expressions in Emacs, based on a recursive-descent parser for regexp syntax. In addition to converting (a subset of) PCRE syntax into its Emacs equivalent, it can do the following:

• convert Emacs syntax to PCRE

• convert either syntax to rx, an S-expression based regexp syntax

• untangle complex regexps by showing the parse tree in rx form and highlighting the corresponding chunks of code

• show the complete list of strings (productions) matching a regexp, provided the list is finite

• provide live font-locking of regexp syntax (so far only for Elisp buffers – other modes on the TODO list).

This package provides transparent Age file encryption and decryption in Emacs. It is based on the Emacs EasyPG code and offers similar Emacs file handling for Age encrypted files: maintain .org.age encrypted Org files, provide Age encrypted authentication information out of .authinfo.age, open/edit/save Age encrypted files via Tramp...

Super-save auto-saves your buffers, when certain events happen, e.g., when you switch between buffers or when an Emacs frame loses focus. You can think of it as both something that augments and replaces the standard Auto-save mode.

emacs-eimp allows interactive image manipulation from within Emacs. It uses the mogrify utility from ImageMagick to do the actual transformations.

Eweouz is an tool for looking up contacts from Evolution Data Server from Emacs. It is similar to BBDB, except much, much simpler.

Parsec is a parser combinator library for Emacs Lisp, similar to Haskell's Parsec library. It contains most of the parser combinators in Text.Parsec.Combinator, and more combinators can be added if necessary! Most of the parser combinators have the same behavior as their Haskell counterparts. Parsec also comes with a simple error handling mechanism so that it can display an error message showing how the parser fails.

This package provides a major mode to search YouTube videos via an Elfeed-like buffer. Information about videos displayed in this buffer can be extracted and manipulated by user-defined functions to do various things such as playing them in some video player, or downloading them.

This package provide functions to move the current line using M-up or M-down if a region is marked, it will move the region instead.