http://www.2020flossroadmap.org/ -- FLOSS Roadmap 2020
http://www.ibm.com/developerworks/opensource/library/os-newlight/index.html?ca=dnw-1116&ca=dth-o -- IBM article
A related page on cluster software stacks is on the HPC-SIG Wiki.
This section is to collect information about open source or free software which is widely used as an alternative to commercial or proprietary offerings. It has a focus on software relevant for research and HPC systems. There are other sites for more general software, for instance see http://www.osalt.com and http://alternativeto.net. We will split this collection into categories off the links below. Mike Croucher's blog is at http://www.walkingrandomly.com/. See also the Open Science Project http://www.openscience.org.
A lot of general information can be found via the Open Directory Project http://www.dmoz.org/Science and Wikipedia http://www.wikipedia.org.
There are also a number of books on this subject, e.g. see Google Books
A report on the breakout session we held at MEW20 on “Open-source alternatives to commercial scientific software” is available here: http://bit.ly/8SulTc .
Note many of the free packages are included with Linux distributions such as Gentoo.