Contribs.org is committed to the open-source model of software development, and SME Server is based on proven, time-tested, open-source technologies - for example, the Linux operating system and the Apache web server. We freely share our software source code with others to enhance and build upon SME Server's products, and we encourage our users to pass along their comments and suggestions.
some of the open-source technologies featured in the SME Server server and gateway
Linux Operating System
Linux has been rapidly gaining market share as the most stable and reliable operating system available for server applications. Created entirely from open-source software, Linux is an increasingly attractive alternative to Windows. It is the only non-Microsoft operating system currently growing in global marketshare.
Apache Web Server
Apache is now the most widely used web server in the world. It is unmatched for reliability, performance, and flexibility.
Qmail Mail Transport Agent
Qmail is a secure, reliable, efficient mail transport agent. Qmail's straight paper-path philosophy guarantees that a message, once accepted into the system, will never be lost.
ProFTPd FTP Server
The ProFTPd FTP server is in wide use throughout the Internet, and offers high throughput and stability. The ProFTPd FTP server, in particular, provides enhanced security.
Squid Internet Object Cache
Squid offers high performance proxy caching for web clients. It supports FTP, Gopher, and HTTP requests.
Additionally, the developer wizards in our community have provided help and how tos to install many other software packages that extend its basic functionality. Examples include portal software like postnuke or Plone (Zope), antivirus software, groupware, wikis, CVS, VPN software, and many others.
Check out our Howto and contribs and 
Web Links sections!
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