Web servers, Mail servers
http://frontier.userland.com/
The UserLand Frontier Kernel is a powerful development platform including
an integrated object database, scripting language, a script editor and debugger,
outliner, a multi-threaded runtime and an integrated HTTP server. UserLand's
Kernel is the low-level technology behind the commercial products.
http://www.zope.org/
Zope is an open source application server for building content management
systems, intranets, portals, and custom applications. The Zope community
consists of hundreds of companies and thousands of developers all over the
world, working on building the platform and Zope applications. Zope is written
in Python, a highly-productive, object-oriented scripting language.
http://www.borland.com/
Borland AppServer™ is well-suited for high-end J2EE applications in both
embedded and enterprise deployments, that have significant scalability and
reliability requirements.
http://www.icewarp.com/
A multiple award winner, Merak Email Server is a reliable, easy to use and
afforable communication solution that is used by more than 30 million users
worldwide. This powerful server solution contains every feature, module
and extension you might desire and yet is extremely easy to administer.
http://www.altn.com/
Long-term test MDaemon Mail Server – Many new protocol expansions and safety
features are designed to protect email recipients from trash and attacks.
MDaemon knows them all.