Affogato is a unique sans serif open source font which comes with 5 font weights.
Fuji Sans is a beautifully designed, bold sans serif font that is free to download for personal use.
Akrobat is a free condensed geometric sans serif font family that comes with 8 weights from thin to black.
Gilroy is a exceptionally good looking sans serif font with a geometric touch.
Kayak Sans is a modern grotesque type designed with the intention of not standing out.
Three is a semi condensed sans serif font that you can download for free.
Muller Narrow is the condensed version of the original Muller font family.
Phenomena is a modern sans serif font based on round geometric shapes that you can download for free.
Fenton font family is a free sans-serif font that comes with 6 weights. It has a higher lowercase structure than other fonts and it gives a modern, rounded and squared character.
Mosk is a clean and modern looking free-to-download sans serif font that comes with 9 weights from thin to Ultra bold weight.
Now Typeface is a free sans serif font that is geometrical, low contrasty with a bit of character. It comes with 6 weights, from thin to black
Fester is a semi-condensed, uppercase-only free font that comes with 4 different weights. Fester font is similar to Bebas Neue, it looks great with big sizes.
HK Grotesk is a sans serif typeface inspired from the classic grotesques. This Helvetica-ish font comes with 2 weights: regular and bold.
Wask is a condensed sans serif font that sits in between DIN and Bebas Neue.
Rubik is a open source sans serif font family with slightly rounded corners designed by Philipp Hubert and Sebastian Fischer, and as part of the Chrome Cube Lab project.