Amit Deshpande and Dirk Riehle from SAP Labs have conducted and published a research on the growth of open source software.
The data has been culled from Ohloh.net and is based on the stats and activity of around 5000 open source projects written in 30 different languages and 103 open source licenses.
Some interesting quotes from the publication:
Successful open source projects like Linux, Apache, PostgreSQL and many others are growing super-linearly. Previous research showed that linear and quadratic growth is the dominant growth pattern of open source software projects
Our work shows that the additions to open source projects, the total project size (measured in source lines of code), the number of new open source projects, and the total number of open source projects are growing at an exponential rate. The total amount of source code and the total number of projects double about every 14 months.
Open Source has taken off handsomely and continues to thrive. It is not just about philosophy any more, it is good business sense.
In case you are interested about Solr stats, see the Solr project page at Ohloh.
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