The TeX Gyre (TG) Math Fonts
The TeX Gyre Math fonts project was conceived in 2007 and put forward as a proposal to the TeX User groups early in 2008. The immediate impulse for the project was the significant step made in 2007 by Microsoft's release of the Cambria Math font with MS Office 2007. Cambria Math is the first font for typesetting mathematics in the for-math-extended OpenType Layout font architecture.
If you want to support this project, you can do so by using the TeX Gyre section of the donation page maintained by TUG.
TeX Gyre Math logotype, by “Jacko”
Why TeX Gyre Math Fonts?
A general description of the purpose of the project will be placed here any time soon, hopefully...
The font itself is currently available as a pre-release, testing version (download).
The package (download) contains the most recent version of the TeX Gyre Pagella Math font.
Not yet available.
The package (download) contains the most recent version of the TeX Gyre Termes Math font.
There is an abundance of resources concerning the very typesetting of mathematics elsewhere. If you are interested in font technicalities however, the situation is not so good and the e-foundry team's page devoted to OTF math fonts which has links to various relevant articles and presentations might be of some help.