SparrowHub is the repository of automation scripts. One can easily create a new scripts with notion of so called sparrow plugins, another could easily find, install and run required script for a specific tasks. In other words - SparrowHub is active network of automation scripts written by other people. You may take an analogy with CPAN for Perl or RubyGems for Ruby.
Want to find a specific sparrow plugin and use it? Take a brief 5 minutes tutorial for sparrow users and then find some plugins using "Search Plugins" form above.
Here the list of links you can find more documentation on Sparrow: