The DejaVu fonts are a font family based on the Vera Fonts. Its purpose is to provide a wider range of characters while maintaining the original look and feel through the process of collaborative development under a free/libre license.
Pro Oodles and oodles of mathematical symbols
Did I mention oodles of the little buggers? LaTeX wouldn't be the juggernaut it is currently in academic circles if it weren't for the DejaVu fonts hitting their stride in the same era of computing. So long as there's a bottle of liquor handy and a way to browse the mathematical symbols in the Vera fonts, you'll never be bored and lonely again.
Pro Forked from Bitstream's Vera family of typefaces
The Vera fonts changed the way the game was played regarding typeface display on digital displays with full hinting for every glyph, allowing the compositor to tweak any character to render well for the specific pixel pattern it had to use for the position it was placed on the screen. It's a pleasant and high-quality foundation for any typographic endeavour.
Pro Condensed versions of Sans and Serif
These were easily overlooked until we all started spending half our lives looking at screens that literally fit in the palms of our hands. They're available for all the font weights of both typefaces and the oblique styles as well. If you're curious why there's no Condensed version of the Mono font, I have the most incredible oceanfront property in Switzerland to sell you. wink