Some years ago Adobe released the Source Pro font “superfamily” as an open source product that provides a Serif (it recently got real italics), Sans and monospaced variants
The fonts come in several weights, from Extra Light to Black, for all its variants (only the Serif is shown in the full example)
With a really nice and consistent design, these fonts offer a correct set of OpenType features that make them ideal for “formal” documents.
Note to the frequent reader: First of all, thank you for being here! This year I’ll start publishing articles biweekly instead of each Monday, at least for now. Let’s see if I’m able to regain the old schedule!