There are several available. If you want a list, there's a pretty good article here:
http://www.windowsitpro.com/article/intrusion-detection-and-prevention/buyer-s-guide-windows-server-intrusion-detection-products.aspxI've attached their PDF comparison table.
If you want a big name you can always go with Microsoft's own product, Forefront Threat Management Gateway.
http://www.microsoft.com/forefront/threat-management-gateway/en/us/Hope this helps.