This is a ruby version of the perl module Lingua::LinkParser, by Dan Brians. It wraps a grammerical sentence parser which you can use to determine the structure of a sentence (english only...). Currently has some functionality missing, but it's basic usage is there.
This project has the following developers:
New HTML Parser: The long-awaited libxml2 based HTML parser code is live. It needs further work but already handles most markup better than the original parser.
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If you're a C programmer with some spare time, take a look at the mod_virgule project page and help us with one of the tasks on the ToDo list!