Additional Links
The Free Software Foundation, the organization to manage the idea and the outcome of the GNU project
The GNU project itself
Homepage of the Open Source Initiative which maintains the Open Source Definition and the list of OSI approved licenses
The Open Source Definition which determines the scope of the OSLiC conceptually
The OSI list of approved licenses which determine the scope of the OSLiC by items
The OSI mailing lists by which the licenses are reviewed (discussed) and some specific issues of the scope of a license are discussed
German written site being maintained by famous experts in open source licenses which offers very deep insights into legal aspects of using open source software compliantly.