TeX

It's worth pointing out that the LM fonts are another indicator of the big complexities of getting font licensing done right and somewhat a warning for the problems inherent in trying to build your own community-specific model.

AFAICT very experienced and prominent people in the the TeX community went through a tough time struggling with various aspects of the licensing issues.

These fonts are now under the project-specific Gust Font License and the LPPL:
http://www.gust.org.pl/projects/e-foundry/latin-modern/in...

Notice the following conclusion describing the now deprecated project and organisation-specific licenses created in the interim on http://www.gust.org.pl/projects/e-foundry/licenses

"The Historical Part

As of September 15, 2006 the licenses described hereunder are not in use. This part of the site will be left as is for historical reasons. Perhaps some day “A Cautionary Tale: Think Thrice Before Trying to Create Your Own License” might be written and then it will become clear why GUST no longer thinks that GFSL and GFNSL are adequate licenses."