Philipp H Poll and his team have provided us with the elegant and readable Linux Libertine. It out-classes Times New Roman by a country mile. The package includes Linux Biolinium, which is an open-source replacement for Linotype’s Optima.
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Linux Libertine looks great when printed, and if you want serifs on your display font then Libertine is your man. However, I’m coming to prefer a sanserif face, and a monospaced one at that, and Ralph Levien’s crisp and humane Inconsolata is now my first choice for the screen.