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Shpider. Copyright 2009-2010 John Morrice.
Shpider is a web automation library for Haskell. It allows you to quickly write crawlers, and for simple cases ( like following links ) even without reading the page source.
It has useful features such as turning relative links from a page into absolute links, options to authorize transactions only on a given domain, and the option to only download html documents.
It also provides a nice syntax for filling out forms.
An example:
runShpider $ do
download ""
theForm : _ <- getFormsByAction ""
sendForm $ fillOutForm theForm $ pairs $ do
"occupation" =: "unemployed Haskell programmer"
"location" =: "mother's house"