Fontmonkey fonts are free for for all use, commercial or non-commercial.
To be clear: They do not cost anything.
If you do use them for something, though, I would love to here about it. I would appreciate a sample of the thing for which you used the font, a photo of it, or even just an e-mail telling me about it.
You can contact me via the website or by e-mail at pmagnus
fecundity.com
You are also encouraged to acknowledge fontmonkey or link to me, although
neither is strictly speaking required.