
The Open Source Census, a global, collaborative project to collect and share quantitative data on the use of open source software, announced that it has found massive open source use on Windows machines...[click continue reading for the stats]...
Participants scanning Windows machines averaged 39 open source software packages per machine scanned. Linux users of course found more open source, with 87 packages on average, but that also includes open source that is shipped with the Linux distributions.
The most popular packages are similar for both Windows and Linux platforms with 7 of the top 10 packages in common.
The Open Source Census looked at over 300,000 open source package/project installations over a six month period.