Free operating systems software for linux

Abyss Web Server is a compact web server available for Windows, MacOS X, Linux, and FreeBSD operating systems.
Despite its small footprint, it supports HTTP/1.1, dynamic content generation through CGI/1.1 scripts, ISAPI extensions, Server Side Includes (SSI), custom error pages, password protection, IP address control, anti-leeching, and bandwidth throttling.
It features also an automatic antihacking system as well as a multilingual remote web management interface that makes its configuration as easy as browsing a web site.
Main features:
- Virtual hosting (support for many hosts on a single computer)
- ISAPI extensions support
- Custom directory listings
- Multilingual remote web configuration interface (console)
- Unicode support
- Automatic anti-hacking system
- Anti-leeching system to control cross-site linking
- Server-wide bandwidth control
- Per file and per directory bandwidth control
- Windows System Service, MacOS X Startup Item, and Linux/FreeBSD daemon support

Midish is a MIDI sequencer/filter for Unix-like operating systems (tested on OpenBSD and Linux) implemented as a simple command line interpreter, like a shell. Its intended to be lightweight, fast, and reliable for real-time performance.
Main features:
- multiple MIDI devices handling
- synchronisation to external midi devices
- real-time MIDI filtering/routing (controller mapping, keyboard splitting, ...)
- track recording, metronome
- basic track editing (insert, copy, delete, ...)
- track quantisation
- import and export of standard MIDI files
- tempo and time-signature changes
- system exclusive messages handling
Midish is open-source software distributed under a 2-clause BSD-style license. Currently in development (contributions are welcome), it can safely be used for sequencing and filtering.
Enhancements:
- This release adds support for system exclusive messages and synchronization with external MIDI devices, new filtering rules and new editing functions, and improved documentation and usability.

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.

Kaboot Linux Operating system aims to provide an operating system which you can take anywhere and has all your favourite programs on.

Kaboot operating system is avaliable as a Live CD or Live USB you can take with you anywhere.

A number of different versions are avaliable, two optimised for size or speed, one for functionality, and one science based.

All containing a host of useful programs able to boot virtually any computer (meeting the minimum requirements) from CD and USB.

Kaboot is still in active development and if you find a bug or fix, you can let me know in the forums.

Kaboot Komplete has everything an average user needs, the familiar KDE for the desktop, Open Office 2.0, Thunderbird and Firefox along with many other useful applications and a host of desktop games.

To log in username: root passwd: toor

HeavenOS is an original, alternative 32-bit operating system for Intel 80386 compatible processors.

It is made with NASM (The Netwide Assembler), and is not intended to compare to modern operating systems, but to try to get the best features and discover better ways to do things.

HeavenOS project is intended to be a simple and pratical platform for development, running with a small amount of code.