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 ;)