Sometype Mono by Ryoichi Tsunekawa
Sometype Mono is a monospaced font family with good legibility, optimized for code and tabular layouts. It’s completely free for both personal and commercial use.
For more details, font source download, documentation, and contributions visit Sometype Mono Github repo or the Sometype Mono website.
EOT, OTF, TTF, WOFF, WOFF2
SIL Open Font License → Licenses explained