Contents of Essentials

Allegro is a multi-platform game library that provides many functions for graphics, sounds, player input (keyboard, mouse, and joystick), and timers. It also provides fixed and floating point mathematical functions, 3D functions, file management functions, compressed datafile, and a GUI.
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The Advanced Linux Sound Architecture project is being developed in the Linux operating system and is released under version 2 of the GPL (GNU general public license) and the LGPL (GNU library general public license).
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Avifile is a library that allows you to read and write compressed AVI files in most common video & audio formats (Indeo® Video, DivX, etc.) under x86 Linux. Compression and decompression are performed with Win32 DLLs. It includes a simple AVI player and a Video4Linux capture program. Currently it is under heavy development, and while some features (such as AVI playback) already work, some (audio compression) are not yet successfully implemented.
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The best compiler in the world?
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This directory contains the latest kernel sources plus the patches needed to create all versions between these and those on last month's discs.
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LessTif is an LGPL'd implemention of the OSF/Motif standard GUI toolkit for X11. LessTif aims to be source compatible with the OSF/Motif versions 1.2 and 2.1. Currently 1.2 support is almost complete and most Motif 1.2 apps should compile and run out of the box, whilst 2.1 still has very little functionality.
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Mesa is a 3-D graphics library which uses the OpenGL API (Application Programming Interface). Mesa cannot be called an implementation of OpenGL since the author did not obtain an OpenGL license from SGI. Furthermore, Mesa cannot claim OpenGL conformance since the conformance tests are only available to OpenGL licensees. Despite these technical/legal terms, you may find Mesa to be a valid alternative to OpenGL. Most applications written for OpenGL can use Mesa instead without changing the source code.
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Text-based interface creation library
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Ogg Vorbis is a completely open, patent-free, professional audio encoding and streaming technology with all the benefits of Open Source.
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