Free multiple operating software for linux

Earth allows you to find files across a large network of machines and track disk usage in real time. The project consists of a daemon that indexes filesystems in real time and reports all the changes back to a central database.
This can then be queried through a simple, yet powerful, web interface. Think of it like Spotlight or Beagle but operating system independent with a central database for multiple machines.
Earth is initially focused on managing the explosion of data that occurs in digital visual effects work.
Enhancements:
- Many small usability improvements, several significant performance improvements for the Web application, reduced database size, code improvements, and a much improved command line interface to the Earth daemon.

Teddy is an OpenGL-based 3D graphics library written in C++. The main purpose was to be a simple scene graph manager. Here is a brief list of main features:
scene graph
windowing system
multiple scenes
multiple cameras
multiple camera windows
LightWave objects
LightWave scenes
Teddy was, at the time of active development, tested and working on GNU/Linux, FreeBSD and Microsoft Windows operating systems. Teddy strictly required one external library, the Simple Directmedia Layer. Other libraries were not strictly needed, but highly recommended. Below is list of libraries that Teddy used:
SDL
SDL_image
SDL_mixer
libjpeg
libpng
libz
It is quite likely that trying to build Teddy on modern setups fails.
If you would like to contact me, then please note that currently (beginning of 2005) my university account has been idle for a while and thus locked. Eventually I will open it again, but the recommended way to contact me anyway is to mail me at timo at futuremark.com.
Enhancements:
- Fixed problems with TinyGL, should work fine again
- Fixed sqrt for non-msvc compilers
- Fixed LightWave material parsing
- Added support for lefthanded coordinate systems (LightWave)
- Added support for directional lights
- Added Lightwave light support (point and directional)
- Support for SWIG work in progress
- Changed most defines to static constant class members
- Got rid of too large gl_ext
- Dropped unused sources from distribution
- Fixed drawbicolrect
- Used Valgrind to locate some bugs and memory leaks

TCVP is a video and music player and encoder/transcoder for Unix-like operating systems. It is primarily targeted at Linux, mainly because of lacking standards for audio and video output, and because the authors use Linux.
Adding support for other POSIX-compliant operating systems should be easy, provided that some means of displaying video and playing sound exists.
Main features:
- Pipelined design, allowing insertion of filters at any stage.
- Automatic selection of demuxers, decoders, and output drivers, based on user-defined order of preference.
- Buffering of decoded audio and video for smooth playback.
- Multi-threaded: multiple CPUs can be used if present.
- Multiple user interfaces. A flexible skin based X11 GUI is included, as well as a simple command line only interface.
- Playlist with shuffle and repeat.
- Highly configurable.
- No XML.

The MPFR library is a C library for multiple-precision floating-point computations with exact rounding (also called correct rounding). It is based on the GMP multiple-precision library.

The main goal of MPFR is to provide a library for multiple-precision floating-point computation which is both efficient and has a well-defined semantics. It copies the good ideas from the ANSI/IEEE-754 standard for double-precision floating-point arithmetic (53-bit mantissa).

MPFR is free. It is distributed under the GNU Lesser General Public License (GNU Lesser GPL). The library has been registered in France by the Agence de Protection des Programmes under the number IDDN FR 001 120020 00 R P 2000 000 10800, on 15 March 2000.

This license guarantees your freedom to share and change MPFR, to make sure MPFR is free for all its users. Unlike the ordinary General Public License, the Lesser GPL enables developers of non-free programs to use MPFR in their programs. If you have written a new function for MPFR or improved an existing one, please share your work!

TALK is a strictly and statically typed assembly language that is flexible and powerful enough to write operating system kernels.

For example, memory management (i.e. malloc/free) and multi-thread management can be implemented in TALK.

ArX is a Revision Control System (RCS), like CVS, Subversion, or GNU arch. It manages "archives" (collections of files), such as source code files for a software project.
ArX tracks the history of each file, along with change comments, version tags, forks and branches, etc. It can store files and documents of any kind, but the largest benefits are with text files, rather than binary files.
Main features:
- Ease of learning and use
- Powerful branching and merging features
- Speed, even when working with large repositories
- Effective distributed development
- Friendly and helpful user and developer communities
- Cryptographic data integrity features
- Ability to publish archives on almost any server
- Portability to multiple operating systems (still in progress)
Like CVS (and most modern RCS tools), ArX uses an "optimistic" locking model, which allows multiple developers to modify the same file at the same time, and then resolves any conflicts as each developer checks in his or her work. While this may sound scary if you are used to systems that "lock" files, it actually works very well, as confirmed by the thousands of projects that have used this approach (in CVS) for many years.
Unlike CVS and most traditional RCS tools, ArX is "distributed", which means that ArX does not require a central server. Each developer can maintain their own "archive" of their projects, but can easily share their work with other developers. This modern design works well with teams that are geographically distributed, and especially with teams where some contributors are not part of the core team.
ArX includes an optional patch queue manager to enable centralized, CVS-style, development when desired. ArX differs from many of the newer distributed SCM tools in that it does not require every working tree to contain an entire copy of the archive history.
Each archive can store multiple branches, each of which could be checked out in multiple working trees. Other tools may use the terms "patch pooling" or "centralized storage" for this type of feature, and it is important for efficient branching on systems without hardlinks. Also, ArX archives can link to other archives (including remote archives) for older history, allowing branches of remote projects to be very small and fast.
Another important feature of ArX is that an archive can be published on any HTTP web server. It does not require any special code running on the server, which has some significant advantages: First, it allows projects to host their code on almost any inexpensive web site, including the free personal home pages offered by many ISPs. Second, it keeps the server very secure, because the only service required is a standard web server such as Apache or Boa.
Enhancements:
- ArX now uses three-way merging as a default, and supports third party merge tools.
- ArX is also much more clever about renames.
- "merge" now uses the --update option instead of using heuristics.
- ArX now records when there are conflicts in the tree, and will not let you commit unless they are resolved.
- ArX now uses -v and -q for verbosity.
- "commit" now supports --author and --date options for Tailor.
- The patch queue manager has been updated, and some small bugs were fixed.

J Operating System is primarily intended for programmers.
Target Users:
- Hobbiests--You used to buy computers to do programming. They didnt do much else. Windows doesnt even come with a compiler, which is ironic since Bill Gates wrote BASIC. The "J" operating system is primarily intended for programmers. Ive attempted to lower the bar, so amateurs can contribute. I hope to recreate the dynamic environment that used to exist when the Commodore 64 was around and everyone was creating odd-ball software.
- Researchers--Im sure many lab researchers still use DOS because they have to interact with hardware, which is difficult with Windows.
Main features:
- No security! You can access all ports, memory and disk blocks to your hearts content. When youre working with your own computer, security just gets in the way and makes things slow--I hate anti-virus and anti-spyware because they just slow things down. When you know you dont have a risk, have no secrets and do regular back-ups, who needs security?
- Uniformity
- There is no virtual memory and everyone is on the same address-map. You can easily communicate between tasks, passing addresses. Addresses start at a base of zero and, essentually, segment registers are not used.
- There is basically one language to learn called "C+" which is a little more than "C", but less than "C++". You dont need to learn a scripting langauge because everything uses this syntax.
- There is an extension of ASCII called "J" rich text which allows colors, links, graphics and various widgets in your documents. This format is used in source code, documents, help, menus, etc.
- Support for compressed, encrypted and contiguous files.
- FAT32, FAT12 and ISO9660 filesystems.
- Blazing-fast compiler which can recompile everything in 5 seconds. It doesnt optimize.
- All source code is included and its still around a Meg.
Hardware:
- PS/2 mouse and keyboard
- VGA graphics
- Some hard drives. Must be on the primary or secondary IDE controller and support LBA28. Drives of 120Gig are the limit.
- Some CD-ROM/DVD drives, including burning.
- Some floppies. Just 1.44Meg and not all types.
- No USB support yet
- No network support yet
- ASCII printers on the parallel port are supported.

Rivendell aims to be a complete radio broadcast automation solution, with the facilities for the management, scheduling, acquisition and playout of audio content.
As a robust, functionally complete digital audio system for broadcast radio applications, Rivendell uses industry standard components like the GNU/Linux Operating System, the AudioScience HPI Driver Architecture and the MySQL Database Engine.
Main features:
- A complete GPLed radio automation system.
- Designed for efficient on-air use, with large, touchscreen-friendly controls.
- Up to three full automation logs may be operated from a single computer.
- Extensive support for live assist environments, with multiple SoundPanel arrays available at the touch of a finger.
- All configuration is done by means of point and click interfaces -- *no* arcane configuration files to edit!
- Support for both PCM16 and MPEG Layer 2 audio formats.
- Full support for both analog and AES3 digital audio interfaces, using high-quality audio adapters manufactured by AudioScience Inc. and the JACK Audio Connection Kit.
- Designed by radio broadcasters, for radio broadcasters.
- Completely free and open -- no dongles, unlock codes, software keys or other arbitrary limitations.
Components:
- RDAdmin ~ comprehensive system configuration and management tool
- RDLogEdit ~ complete program log editing tool
- RDLibrary ~ audio acquisition and management tool, for maintaining a library of audio content
- RDAirPlay ~ on-air audio playout application
- RDCatch ~ automatic audio recorder and event scheduler specifically optimized for simultaneous capture of multiple long-form audio programs
- RDLogManager ~ tool for integration with a wide array of third-party traffic and music scheduling systems