Programs to create font files (TTF/Opentype)?

See the specs for OTF(a href="http://www.microsoft.com/typography/otspec/otff.htm)" rel="nofollow"http://www.microsoft.com/typography/otsp…/a and TTF(a href="http://developer.apple.com/fonts/TTRefMan/index.html)." rel="nofollow"http://developer.apple.com/fonts/TTRefMa…/a Also, there's an open source app for creating fonts called FontForge, you can look at its implementation.