Operating Systems
We are your 64-bit software guide...

The free and open source Solaris Operating System—available on hundreds of x64/x86 platforms and supported for thousands of open source and ISV applications and partners.
Compatibility:    - Solaris

The Red Hat Enterprise Linux 5 Desktop is the secure and extensible alternative for client systems like desktops and laptops in a business IT environment. Plus, the full set of standard productivity applications for a general IT workplace.
Compatibility:    - Linux

Microsoft Windows Server 2008 helps you to increase the flexibility of your server infrastructure while saving time and reducing costs. Powerful new management tools and security enhancements allow you to have more control over your servers while providing advanced protection so you can spend less time on everyday tasks and more time bringing greater value to your organization.
Compatibility:    - XP - Vista | Windows 7

Red Hat Enterprise Linux is available in two variants for servers. A base Red Hat Enterprise Linux server is designed for small deployments while Red Hat Enterprise Linux Advanced Platform is designed for mainstream customers and provides the most cost-effective, flexible, and scalable environment. Both versions are based on common core technology. Both include a comprehensive suite of open source server applications and virtualization capabilities.
Compatibility:    - Linux

Explore more than 200 new features that will change how you use your computer. Discover how the innovations in Tiger work together seamlessly to give you a more enjoyable and functional platform for anything you do with your Mac.
Compatibility:    - Mac

Offering unmatched levels of privacy, increased accountability and reduced risk of security violations - and proven effective in Government, Intelligence and Security agencies and gaining a foothold in Finance, Healthcare, Retail, and other industries - the Trusted Solaris Operating System (OS) provides built-in security on a commercial-grade OS. With the Trusted Solaris OS, users from the desktop to the data center continue to reduce security risks and have higher confidence in the security of their networks.
Compatibility:    - Solaris

The Windows Server 2003 family of products can help make your network a strategic asset for your organization. Find out about trial software, product details, webcasts and virtual labs.
Compatibility:    - XP - Vista | Windows 7

No matter how you use your PC from home entertainment to business productivity there's an edition of Windows Vista that's right for you.
Compatibility:    - Vista | Windows 7

Gentoo is a free operating system based on either Linux or FreeBSD that can be automatically optimized and customized for just about any application or need. Extreme configurability, performance and a top-notch user and developer community are all hallmarks of the Gentoo experience.

Thanks to a technology called Portage, Gentoo can become an ideal secure server, development workstation, professional desktop, gaming system, embedded solution or something else -- whatever you need it to be. Because of its near-unlimited adaptability, we call Gentoo a metadistribution.

Of course, Gentoo is more than just the software it provides. It is a community built around a distribution which is driven by more than 300 developers and thousands of users. The distribution project provides the means for the users to enjoy Gentoo: documentation, infrastructure (mailinglists, site, forums ...), release engineering, software porting, quality assurance, security followup, hardening and more.

To advise on and help with Gentoo's global development, a 7-member council is elected on a yearly basis which decides on global issues, policies and advancements in the Gentoo project.
License: Free
Compatibility:    - Linux

The main difference of course is that grml64 is a 64bit-version whereas (normal) grml is 32bit-only. grml64 provides a 64bit kernel which supports 32bit userspace applications. grml64 also provides libc6-i386, libc6-dev-i386, several lib32* packages and ia32-libs. Due to space reasons and because some packages aren't available for amd64 yet some packages are missing on grml64 compared to (normal, 32bit) grml.
Compatibility:    - Linux