BASIS WEBServer
enables universal access to information that publishers and information providers want to disseminate electronically.
Cykic Software
Hype-It 1000
Elimar Soft
offers a DDE server for Siemens S5 PLCs.
MSDN Online Web Workshop - Server Technologies Home
WebSite
WebSite API
WebSite Performance Analysis
Windows Web Server Utilities [wgg.com]
ZBServer
Web and Gopher server