CsQuery

I'd add ImageResizer for resizing images ( and in MVC resizing them in a restfull way...). You can also localcache them or cache external images (resized). You can also store them in the cloud and add effects to the images. Many things are possible : http://imageresizing.net/ It isn't possible in Asp.Net 5 (vNext) though :( - because of the cross platform integration. Also, https://github.com/jamietre/CsQuery is pretty nice for parsing webpages and using CSS Selectors (jquery style) With CsQuery, you could use aBot ( https://github.com/sjdirect/abot ) for crawling ;)

One more I'll add to the mix that has come in handy several times: CsQuery jQuery port. https://github.com/jamietre/CsQuery

CsQuery is another interesting library for C# along those same lines: https://github.com/jamietre/CsQuery