Today LWN published a copy of "Open Source Catalogue 2007" (http://lwn.net/images/pdf/opteros-catalog-2007.pdf) by Optaros (http://www.optaros.com/).
Licensed under Creative Commons License (Attribution 2.5), the catalogue is designed to help companies decide which open source projects are enterprise ready.
Not all listed software is free software, nevertheless this may be a good hint also for the Free Software catalog.
bye
--- Stefano Spinucci FSFE Fellow