Always free - The Apache Software Foundation
https://www.apache.org/free/
WEBIs Apache software really free to download?¶ Yes. Over 300 Apache projects and podlings provide software products that may be downloaded and used at no cost, including everything from the world-famous Apache HTTP Server, to Apache Hadoop, to Apache Lucene, to Apache OpenOffice, and many, many more. May I use Apache software for …
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