Lavoisier
[UPDATE: Lavoisier now has bold, italic, and bold-italic versions. I've created a page where you can always get the latest/greatest version: The Lavoisier Page.]
Lavoisier is a free, open source font. Feel free to download it, use it, embed it, tweak it, whatever you want. You can play around with the source file if you have FontLab. If you make a change that you think is valuable, let me know and maybe I’ll incorporate that change into future releases. Meanwhile, I’m distributing it under the SIL Open Font License. Please let me know if you have constructive criticism, or if you use the font to create something cool. Thanks!