The General Public License (GPL) accounts for 73% of open source projects
Go find another source if you don't like that one, there's plenty others, as anyone constantly pushing this stuff on everyone should already know.
Yup open up for your OSS forced feeding! Thats right kids despite the fact I have said hundreds of times that Closed source and opensource compliment eachother nicely, and that some of the best products of their types are closed source Im 'pushing' this stuff..
LOL talk about a moonbat..
I've heard up to 80%. However, a quick search through SourceForge (the most popular repository for OSS, where most of the software is GPL) will show you that a vast majority of those projects are nothing, most not even out of the beta stage. There are about four times as many projects that have not progressed to production/stable/mature as have.
Let's look at software that matters: Linux, gcc, Apache web server, Firefox, Thunderbird, Tomcat, Python, Perl, SpamAssassin, MySQL, PostgresSQL, PHP, FreeBSD, CVS, X-Windows, Solaris, Darwin (OS X core). I can't think of any other open source software off the top of my head right now, can you?
Four of those are under the GPL, and MySQL has an alternate commercial license. The rest are under other licenses.