Free multiple operating software for linux

VMware Server product is a robust yet easy to use software for users new to server virtualization technology.
VMware Server enables companies to partition a physical server into multiple virtual machines, and to start experiencing the benefits of virtualization.
Benefits of VMware Server
Provision a new server in minutes without investing in new hardware.
Run Windows and Linux operating systems and applications on the same physical server.
Increase the utilization of a physical server.
Move virtual machines from one physical host to another without re-configuration.
With VMware Server you can:
Streamline software development and testing by allowing developers to create multiple environments with different operating systems on the same server.
Evaluate software in ready-to-run virtual machines without installation and configuration.
Re-host legacy operating systems such as Windows NT Server 4.0 and Windows 2000 Server in a virtual machine running on new hardware and operating system.
Simplify server provisioning by building a virtual machine once and deploying it multiple times.
Leverage pre-built, ready-to-run virtual appliances that include virtual hardware, operating system and application environments. Virtual appliances for Web, email, proxy and other infratructure services are available for download from the VMTN Virtual Machine Center.
VMware Server is the first step to VMware Virtual Infrastructure
While VMware Server is a compelling product for new virtualization users, VMware Virtual Infrastructure products-ESX Server with Virtual SMP and VirtualCenter with VMotion-enable companies to implement large-scale production server consolidation, business continuity, and enterprise desktop solutions with enterprise-class performance, high availability, manageability and security. View a comparison between VMware Server and VMware Virtual Infrastructure.
Enhancements:
- This release fixes four security vulnerabilities, as reported in CVE-2007-1337, CVE-2007-1877, CVE-2007-1069, and CVE-2007-1876.
- These vulnerabilities permitted denial of service, crashes of Windows guests, or corrupted stack pointers.
- A problem with VMware Tools that caused the guest to run out of memory was fixed.
- A crash in the VIX API was resolved.
- Building of the kernel and the HGFS modules was improved.
- Several occasional crashes were fixed.

Inferno is a compact operating system designed for building distributed and networked systems on a wide variety of devices and platforms.
Inferno was originally developed at Bell Labs (the research division of Lucent Technologies).
Inferno Operating System is a well-designed, economical operating system particularly suitable for use in networked devices such as advanced telephones, hand-held devices, TV set-top boxes, and many other embedded applications.
Inferno can run in native mode on an embedded system or in emulation mode under many different operating systems. Inferno has many features in common with Plan 9.
Cross-Platform Portability
Inferno can run as a user application on top of an existing operating system or as a stand alone operating system. Most of the popular operating systems and processor architectures are supported:
Host Operating Systems:
- Windows NT/2000/XP
- Irix
- Linux
- MacOS X
- FreeBSD
- Solaris
- Plan 9
Supported Architectures:
- Intel x86 (386 & higher)
- Intel XScale
- IBM PowerPC
- ARM StrongARM (ARM & Thumb)
- Sun SPARC
Inferno also runs as a plug-in under Internet Explorer version 4 and higher. Each Inferno system presents an identical environment to the applications, irrespective of the underlying host OS or architecture, allowing the developer to work with a truly homogeneous environment across multiple different platforms.
Portable Applications
Inferno applications are written in Limbo, a modern, safe, modular, concurrent programming language with C-like syntax. It is more powerful than C but considerably easier to understand and debug than C++ or Java. Limbo code is compiled into architecture independent byte code which is then interpreted (or compiled on the fly) on the target processor. This means that any Inferno application will run identically on all Inferno platforms.
Transparent Resources
Inferno offers complete transparency of resources and data using a simple but powerful namespace system. By representing resources as files and having one standard communication protocol, resources such as data stores, services and external devices can easily be shared between Inferno systems. A resource interface may be imported to the local system and used by the applications without them knowing, or needing to know, whether it is local or remote.
Security
High level security is an important part of the Inferno system. By using one standard protocol for all network communication, security can be focused on one point and provided at a system level. Inferno offers full support for authenticated, encrypted connections using a certificate based user identification scheme and variety of algorithms including:
- IDEA, 56 bit DES, 40, 128 and 256 bit RC4 encryption algorithms
- MD4, MD5 and SHA secure hash algorithms
A Complete Solution
Inferno is not only an operating system, it is also a complete development environment, providing all the tools necessary for creating, testing and debugging the applications that run within it.
- Acme IDE: includes editor, shell, advanced pattern matching tools & more
- Fast Compiler: with full syntax and compile time type checking
- Graphical Debugger: with full stack trace for currently executing threads
- Powerful Shell: with sophisticated scripting capabilities
- UNIX like commands: including bind, grep, gzip, mount, ps, tar, yacc...
Enhancements:
- New licence terms (a `dual licence scheme allowing use as Free Software)
- Styx revision based on 9P2000, and consequent changes to Sys
- Authentication changes
- Improved colour graphics support, including compositing
- Scalable fonts using Freetype
- Revamped Tk implementation
- Window management moved out of Tk to a separate window manager in Limbo
- Limbo: exception handling and fixed-point
- Limbo: other possible changes
- Dis VM changes
- More commands and library modules
- Better network service configuration
- /net/dns served by host and native DNS resolver
- Hosted kernels configured from a parts list as for native kernels
- Signed modules
- Internet Explorer plug-in revised and in source form
- Expanded documentation

DEX Extensible Operating System is an operating system specifically designed for educational and research use. DEX Extensible Operating System allows for the dynamic reconfiguration and customization of various system services using concepts found in extensible operating systems.
It aims to create an operating system design thats easy to understand while having features that are common in todays modern operating systems. Unlike other small operating systems, it is powerful enough to support simple applications that require multithreading and file management.
Its architectural design, with the help of Aspect-Oriented programming, enables easy modification and extensibility. It was developed in C and runs on PCs with 80386 processors or higher.
Enhancements:
- This version is released with a floppy image and the kernel source code.
- The release contains peformance enhancements, source code clean-ups, and a makefile for use with GNU make.

The Contiki Operating System is mostly known as an operating system for networked embedded systems. A few years ago, however, Contikis primary claim to fame was its Commodore 64 port.
With the help of JAC64, a Java-based C64 emulator developed by my colleague and fellow Contiki developer Joakim Eriksson, you can now experience the C64 port of Contiki 1.2-devel1 again, directly in your web browser!
Enhancements:
- Contiki now does dynamic run-time loading and linking of standard ELF files.
- Rime, a protocol stack designed for low-power radio communication, has been added.
- Cooja, a Java-based network simulator for Contiki is included.
- The build system has been reworked to allow for easy cross-compiling for many platforms.
- A new port for the Tmote Sky sensor board has been added.

Synergy lets you easily share a single mouse and keyboard between multiple computers with different operating systems, each with its own display, without special hardware. The project is intended for users with multiple computers on their desk since each system uses its own monitor(s).

Redirecting the mouse and keyboard is as simple as moving the mouse off the edge of your screen. Synergy also merges the clipboards of all the systems into one, allowing cut-and-paste between systems. Furthermore, it synchronizes screen savers so they all start and stop together and, if screen locking is enabled, only one screen requires a password to unlock them all.

With synergy, all the computers on your desktop form a single virtual screen. You use the mouse and keyboard of only one of the computers while you use all of the monitors on all of the computers. You tell synergy how many screens you have and their positions relative to one another. Synergy then detects when the mouse moves off the edge of a screen and jumps it instantly to the neighboring screen. The keyboard works normally on each screen; input goes to whichever screen has the cursor.

In this example, the user is moving the mouse from left to right. When the cursor reaches the right edge of the left screen it jumps instantly to the left edge of the right screen.

You can arrange screens side-by-side, above and below one another, or any combination. You can even have a screen jump to the opposite edge of itself. Synergy also understands multiple screens attached to the same computer.
Running a game and dont want synergy to jump screens? No problem. Just toggle Scroll Lock. Synergy keeps the cursor on the same screen when Scroll Lock is on. (This can be configured to another hot key.)

Do you wish you could cut and paste between computers? Now you can! Just copy text, HTML, or an image as you normally would on one screen then switch to another screen and paste it. Its as if all your computers shared a single clipboard (and separate primary selection for you X11 users). It even converts newlines to each computers native form so cut and paste between different operating systems works seamlessly. And it does it all in Unicode so any text can be copied.
Do you use a screen saver? With synergy all your screen savers act in concert. When one starts they all start. When one stops they all stop. And, if you require a password to unlock the screen, youll only have to enter a password on one screen.

If you regularly use multiple computers on one desk, give synergy a try. Youll wonder how you ever lived without it.

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.