Libertinus Serif is a fork from version 5.3.0 (2012-07-02) of Linux Libertine fonts, addressing several bugs. It includes 9 styles (3 weights: Regular, SemiBold, Bold with mathcing italics, plus 3 special styles: Display, Math and Initials) and features extensive language support.
For details, contributions, sources and more, visit the Libertinus GitHub repo.
Preview of Libertinus Serif Initials, an all-caps initials style ↓
Update 10 June 2020 — version 6.11