Thanks to Red Hat®, a 3 major new sets of fonts under GPL+exception
license.
Named "Liberation" serif, sans and mono, those types are designed to
subset the hegemony of proprietary helvetica, times and monospace
courier new because metric compatible. It means distance between letters
are the same, lenght of documents won't change if helvetica is
substituted by liberation sans font.
"Using these fonts does not subject your documents to the GPL--it liberates them from any proprietary claim"
Well cutted and with a very nice overall ambiance, the sans cut is particularly interesting, and much much nicer than another substitute for helvetica: the Arial. It is clearly affiliated to the Akzident Grotesk, but looks more neutral in the use. The serif cut is very far from the Times, and got formal similarities with the Vera Serif. But it gives a good contemporary, simple and elegant aspect to long readable texts, as far we tested it.
rpm font files and true type font files:
https://www.redhat.com/promo/fonts/