title: Java commercial-friendly R-tree implementation?
body: <p>I need a commercial-friendly (Apache Licence, LGPL, Mozilla Public License etc) <a href="http://en.wikipedia.org/wiki/R-tree" rel="nofollow noreferrer">R-tree</a> implementation in Java, in order to substitute the <a href="http://www.geonames.org/" rel="nofollow noreferrer">geonames</a> Web Service for timezones, as suggested in the question "<a href="https://stackoverflow.com/questions/5584602/determine-timezone-from-latitude-longitude-without-using-web-services-like-geonam">Determine timezone from latitude/longitude without using web services like Geonames.org</a>". I have <a href="http://sourceforge.net/projects/jsi/" rel="nofollow noreferrer">found</a> <a href="http://www.mischiefblog.com/?p=171" rel="nofollow noreferrer">some</a> <a href="http://www.rtreeportal.org/code.html" rel="nofollow noreferrer">around</a>, but I was wondering if someone has evaluated or used them in practice.</p>