HarfBuzz

Handles OpenType and Apple Advanced Typography (AAT) layouts for complex scripts like Arabic and Indic, ensuring correct text shaping across diverse languages as used in major browsers and OSes.

Maintains backward compatibility across major versions, with API/ABI stability since the 0.9.x series, reducing integration risks for long-term projects like Android and Chrome.

Includes libharfbuzz-gpu for encoding glyph outlines using the Slug algorithm, with shader sources in GLSL, WGSL, MSL, and HLSL, enabling high-performance text rendering in games and apps.

Provides libharfbuzz-subset for font subsetting and variable font instancing, reducing file sizes for web fonts and embedded systems, as highlighted in the command-line tools.