As nice as the fonts above are, designers shouldn’t rely entirely on free fonts. Free fonts will never match the quality of the fonts offered by top type design foundries. Budget for professional fonts in every project when possible. Type foundries need the support of the design community to continue innovating and producing excellent fonts.
That being said, if a project requires free fonts, whether due to budget constraints or other reasons, then rest easy knowing that an ever-growing selection of professional-quality fonts are available at your disposal. I continually update a curated list of open-source Web fonts in my side project, Typewolf. You can also follow me @typewolf and check out my other side project, Type & Grids, which uses many of the fonts featured in this article.
Designing a typeface requires a lot of time, patience and very hard work, and type designers should be rewarded for their work. So if you decide to use a free font, please always make sure to support type designers by purchasing the other fonts that they created or donating to support their efforts.