Free
C++ Server Pages 1.6
C++ Server Pages (CSP) allows developers to build Dynamic Web Pages and Web Applications by using C++. You can easily port your C++ projects to the Web, and also, give incredibly high processing performance to your Web Apps.
Commercial
IIS Mod-Rewrite Pro 4.0
With IIS Mod-Rewrite you can manipulate URLs on the fly, make your website search engine friendly, make redirects, block specific URLs, block annoying robots and a lot more.