The Simple Web Automation Toolkit (SWAT) is a test tool that allows users to automate web application testing in multiple browsers. SWAT has a robust Editor with UI recording and SQL tools, integrates with Fitnesse, and is written in C#.
As of 5/1/2012 SWAT has been placed in a maintenance mode and is not going to receive further updates.
ZCore is a set of Creative Studio for designing, testing, building ... solutions based on .NET framework. Contains UML designs tools, code editor & build tools, debug & test tools, user interface create tools ...