I found very nice font that I like. It is called Clear Sans Thin, and they are part of the Clear Sans family created by Intel.

You can download them from here https://01.org/clear-SANS

The package comes with the fonts in multiple formats (eot, svg, ttf, woff).

To install it in Gentoo simply:

emerge -av clearsans

To install it manually:

wget https://01.org/sites/default/files/downloads/clear-sans/clearsans-1.00.zip
unzip clearsans-1.00.zip
sudo cp EOT/* /usr/share/fonts/eot
sudo cp SVG/* /usr/share/fonts/svg
sudo cp TTF/* /usr/share/fonts/truetype
sudo cp WOFF/* /usr/share/fonts/woff