Liberation Sans
Open Foundry · Steve Matteson

A freely licensed grotesque designed for full metric compatibility with Arial, preserving text flow and layout across systems and documents.
About
Designed by Steve Matteson, Liberation Sans replicates the exact metrics of Arial so that documents typeset in one can be exchanged for the other without any reflow. The family covers four styles: Regular, Italic, Bold and Bold Italic. Released under the SIL Open Font License, it is a practical substitute for environments where Arial is unavailable or proprietary fonts are restricted.
Classification
Liberation Sans is a metric-compatible substitute for Arial, itself a grotesque sans-serif, sharing its proportions and spacing to ensure identical text flow across documents.