Mu is a tool for dealing with e-mail messages stored in the Maildir format. Mu's purpose in life is to help you to quickly find the messages you need; in addition, it allows you to view messages, extract attachments, create new maildirs, and so on.

Mumi is a Debbugs web interface.

Mutt is a small but very powerful text-based mail client for Unix operating systems.

musl is a simple and lightweight C standard library. It strives to be correct in the sense of standards-conformance and safety.

MuJS is a lightweight Javascript interpreter designed for embedding in other software to extend them with scripting capabilities. MuJS was designed with a focus on small size, correctness, and simplicity. It is written in portable C and implements ECMAScript as specified by ECMA-262. The interface for binding with native code is designed to be as simple as possible to use, and is very similar to Lua. There is no need to interact with byzantine C++ template mechanisms, or worry about marking and unmarking garbage collection roots, or wrestle with obscure build systems.

MUMPS (MUltifrontal Massively Parallel sparse direct Solver) solves a sparse system of linear equations A x = b using Gaussian elimination.

MUSIC is an algorithm for identification of enriched regions at multiple scales in the read depth signals from ChIP-Seq experiments.

Sampling and evaluation methods to apply Monetary Unit Sampling (or in older literature Dollar Unit Sampling) during an audit of financial statements.

µnit is a small testing framework for C with nested test suites, parameterized tests, timing of the wall clock and CPU time, reproducible random number generation, and more.

Munge is an authentication service for creating and validating credentials. It allows a process to authenticate the UID and GID of another local or remote process within a group of hosts having common users and groups. These hosts form a security realm that is defined by a shared cryptographic key. Clients within this security realm can create and validate credentials without the use of root privileges, reserved ports, or platform-specific methods.

MuPDF is a C library that implements a PDF and XPS parsing and rendering engine. It is used primarily to render pages into bitmaps, but also provides support for other operations such as searching and listing the table of contents and hyperlinks.

The library ships with a rudimentary X11 viewer, and a set of command line tools for batch rendering pdfdraw, rewriting files pdfclean, and examining the file structure pdfshow.

MuPDF is a C library that implements a PDF and XPS parsing and rendering engine. It is used primarily to render pages into bitmaps, but also provides support for other operations such as searching and listing the table of contents and hyperlinks.

The library ships with a rudimentary X11 viewer, and a set of command line tools for batch rendering pdfdraw, rewriting files pdfclean, and examining the file structure pdfshow.

MUMmer is a versatil alignment tool for DNA and protein sequences.

MUSCLE aims to be a fast and accurate multiple sequence alignment program for nucleotide and protein sequences.

This package provides a simple tool allowing users to easily and dynamically explore or document a data set using a tree structure.

Mutest aims to be a small unit testing library for C projects, with an API heavily modelled on high level Behavior-Driver Development frameworks like Jasmine or Mocha.

Mumble is an low-latency, high quality voice chat software primarily intended for use while gaming. Mumble consists of two applications for separate usage: mumble for the client, and murmur for the server.

Mutter is a window and compositing manager that displays and manages your desktop via OpenGL. Mutter combines a sophisticated display engine using the Clutter toolkit with solid window-management logic inherited from the Metacity window manager.

This package provides mailmerge methods for reading spreadsheets of addresses and other relevant information to create standardized but customizable letters. Provides a method for mapping US ZIP codes, including those of letter recipients. Provides a method for parsing and processing html code from online job postings of the American Political Science Association.

Mudlet is a platform for gaming and enhancing game-play primarily with MUDs. Mudlet provides a toolkit and supports a wide variety of protocols for players and creators to tailor an immersive game-playing experience. MUD creators can use Mudlet to add visual flair or build features into their text games. MUD players can utilize the Mudlet toolkit to script and automate parts of their gameplay or add their own visual customization for game data.

This package produces a smooth estimate of the hazard function for censored data.

Murrine is a cairo-based GTK+ theming engine. It is named after the glass artworks done by Venicians glass blowers.

Music21 is a set of tools for helping scholars and other active listeners answer questions about music quickly and simply.

MuSiC is a deconvolution method that utilizes cross-subject scRNA-seq to estimate cell type proportions in bulk RNA-seq data.