Audacity is a cross-platform multitrack audio editor. It allows you to record sounds directly or to import Ogg, WAV, AIFF, AU, IRCAM, or MP3 files. It features a few simple effects, all of the editing features you should need, and unlimited undo. The audio I/O uses PortAudio, which fully supports OSS, Mac OS X CoreAudio, and Windows WMME, and can be compiled with support for ALSA and Jack....

CUPS provides a portable printing layer for Unix(r)-based operating systems. It has been developed to promote a standard printing solution for all Unix vendors and users. CUPS provides the System V and Berkeley command line interfaces, and uses the Internet Printing Protocol ("IPP") as the basis for managing print jobs and queues. The Line Printer Daemon (LPD) Server Message Block (SMB), and AppSocket (a.k.a. JetDirect) protocols are also supported with reduced functionality. CUPS adds network printer browsing and PostScript Printer Description ("PPD") based printing options to support real world printing under UNIX. It includes an image file RIP that supports printing of image files to non-PostScript printers. A customized version of GNU Ghostscript 7.05 for CUPS called ESP Ghostscript is...

LaTeX is a document preparation system for high-quality typesetting. It is most often used for medium-to-large technical or scientific documents but it can be used for almost any form of publishing.

Django is a high-level Python Web framework that encourages rapid development and clean, pragmatic design. It lets developers build high-performing, elegant Web applications quickly.

Wine is an implementation of the Windows API on top of X and Unix. It does not require Microsoft Windows, but can use native Windows DLLs if they are available. It provides both a development toolkit for porting Windows source code to Unix as well as a program loader, allowing many unmodified Windows programs to run on x86 and x86_64 based Unixes....

curl is a command line tool for transferring files with URL syntax, supporting FTP, FTPS, TFTP, HTTP, HTTPS, SCP, SFTP, TELNET, DICT, FILE, LDAP, POP3, IMAP, SMTP, GOPHER, RTMP and RTSP. curl supports SSL certificates, HTTP POST, HTTP PUT, FTP uploading, HTTP form based upload, proxies, cookies, user+password authentication (Basic, Digest, NTLM, Negotiate, kerberos...), file transfer resume, proxy tunneling and a busload of other useful tricks....

The GNU diffutils are comprised of diff, diff3, sdiff, and cmp, utilities for showing differences between files. The manual also documents patch, which uses diff output to update files.

Ruby on Rails is a full-stack MVC framework for database-backed web applications that's optimized for programmer happiness and sustainable productivity. It lets you write beautiful code by favoring convention over configuration.

From the Ajax in the view, to the request and response in the controller, to the domain model wrapping the database, Rails gives you a pure-Ruby development environment. To go live, all you need to add is a database and a web server....

Mercurial is a fast, lightweight Source Control Management system designed for efficient handling of very large distributed projects.

Exim is a message transfer agent (MTA) developed for Unix systems connected to the Internet. It is similar to Smail 3, but expands on Smail features.