General:

• OWIN
• CobraScgi
• ManosFramework
• MonoRail
• SharpWebServer
• NancyWebFramework
•  AntiXSS

Testing with Cobra and browser libraries:

•  WatiN
•  Lightweight Test Automation Framework

Testing with recorder tools embedded in GUI browsers:

•  Windmill
•  Selenium

Testing with command line and/or Python tools:

•  zope.testbrowser
•  twill
•  mechanize

Search help:

• Web apps
• Web development
• Developing web applications

See also: RelatedProjects, DotNetProjects, LibraryTopics