Mathison font family includes 4 styles (2 weights with mathing italics), and has great language support. It also includes currency symbols: $ € £ ¥.
194 Latin diacritics (26+ languages: Czech, Danish, Esperanto, Estonian, Finnish. French, Gagauz, German, Hungarian, Icelandic, Italian, Kikiyu, Latvian, Lithuanian, Malay, Maltese, Maori, Northern Sami, Polish, Portuguese, Romanian, Slovakian, Slovene, Spanish, Swedish, Turkish)
Free for personal and commercial use → Licenses explained