Polymode is an Emacs package that offers generic support for multiple major modes inside a single Emacs buffer. It is lightweight, object oriented and highly extensible. Creating a new polymode typically takes only a few lines of code. Polymode also provides extensible facilities for external literate programming tools for exporting, weaving and tangling.

emacs-validate-html installs the command validate-html, which sends the current buffer to the World Wide Web Consortium’s HTML Validator service and displays the results in a buffer in Compilation mode.

This package provides an Elisp implementation of the OAuth 2.0 draft. The main entry point is oauth2-auth-and-store which will return a token structure. This token structure can be then used with oauth2-url-retrieve-synchronously or oauth2-url-retrieve to retrieve any data that need OAuth authentication to be accessed. If the token needs to be refreshed, the code handles it automatically and stores the new value of the access token.

This package displays ElDoc documentations in a childframe. The childfrme is selectable and scrollable with mouse, even thought the cursor is hidden.

This package provides a DWIM way to switch from an Emacs buffer to a vterm buffer and back again.

emacs-popon allows you to pop text on a window, what we call a popon. Popons are window-local and sticky, they don't move while scrolling, and they even don't go away when switching buffer, but you can bind a popon to a specific buffer to only show on that buffer.

There are some great packages for exporting buffers to particular formats, but each one seems to reinvent the core mechanism of processing the font-lock in a buffer such that it can be exported to a particular format.

This package aims to produce a versatile generic core which can process a fontified buffer and pass the data to any number of backends which can deal with specific output formats.

This package creates buffer-local environments using scripts similar to Direnv. This allows Emacs to call the correct version of external programs such as linters, compilers, and language servers on a per-project basis.

Casual is a collection of opinionated Transient-based keyboard driven user interfaces for various built-in modes.

This package implements a bridge to libvterm to display a terminal in an Emacs buffer.

This is a translation framework on Emacs, with high configurability and extensibility. It can easily be extended to various Text-to-Text conversion scenarios.

message-x assigns a context-sensitive function to the TAB key in Message mode. When on a header line, it performs completion based on which header we are in (for example, newsgroup name completion makes sense on the Newsgroups header, whereas mail alias expansion makes sense in the To and Cc headers). When in the message body, this executes a different function (default: indent-relative).

This package allows for an alternate definition of an Elisp function to be specified and for any differences from the original definition to be examined using Ediff.

This package ships frowny-mode, which makes it so that inserting a single ( when after a : will not automatically close the parenthesis, meaning that only :( is inserted. Works with electric-pair-mode, paredit-mode, and others.

Beacon is an Emacs minor-mode. Whenever the window scrolls a light will shine on top of your cursor so you know where it is.

Monroe is a nREPL client for Emacs, focused on simplicity and easy distribution, primarily targeting Clojure users

Primarily, Binder provides a global minor mode Binder Mode. This allows working with files in the current binder-project-directory.

This package provides functions for converting Unicode to ASCII.

This package provides text objects for evil-mode with boundaries defined by syntax highlighting.

Org-remark lets you highlight and annotate text files, websites, EPUB books and Info documentation using Org mode.

Features:

• Highlight and annotate any text file. The highlights and notes are kept in an Org file as the plain text database. This lets you easily manage your marginal notes and use the built-in Org facilities on them – e.g. create a sparse tree based on the category of the notes

• Create your your own highlighter pens with different colors, type (e.g. underline, squiggle, etc. optionally with Org’s category for search and filter on your highlights and notes)

• Have the same highlighting and annotating functionality for websites (when browsing with EWW), EPUB books with nov.el, Info documentation

Relint (regular expression lint) scans Elisp files for mistakes in regexps, including deprecated syntax and bad practice. It also checks the regexp-like arguments to skip-chars-forward and skip-chars-backward.

This module lets you access the PostgreSQL object-relational DBMS from Emacs, using its socket-level frontend/backend protocol. The module is capable of automatic type coercions from a range of SQL types to the equivalent Emacs Lisp type. This is a low level API, and won't be useful to end users.

EMMS is the Emacs Multimedia System. It is a small front-end which can control one of the supported external players. Thus, it supports whatever formats are supported by your music player. It also supports tagging and playlist management, all behind a clean and light user interface.

This package provides functions to generate random words using user-provided rules.