http://www.ohloh.net/projects/3564 has some interesting metrics on
Lucene (and Solr and Nutch). Most interesting is that they estimate
it is 34 person years to develop at a cost of approximately $1.8
million dollars (using a salary of $55k)
One thing they do not do in their analysis is look at the help that
people give to the community. There are many people in the community
who contribute a whole lot of time answering questions, etc. who
never submit a single patch. They also don't properly credit the
people who created the original patch, merely giving credit to the
committer who applied it.
At any rate, I thought it was interesting.
Cheers,
Grant
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