The HarfBuzz source code is hosted at github.com/harfbuzz/harfbuzz.

Tarball releases and Win32 binary bundles (which include the libharfbuzz DLL, hb-view.exe, hb-shape.exe, and all dependencies) of HarfBuzz can be downloaded from github.com/harfbuzz/harfbuzz/releases.

Release notes are posted with each new release to provide an overview of the changes. The project tracks bug reports and other issues on GitHub. Discussion and questions are welcome on the HarfBuzz mailing list.

The API included in the hb.h file will not change in a compatibility-breaking way in any release. However, other, peripheral headers are more likely to go through minor modifications. We will do our best to never change APIs in an incompatible way. We will never break the ABI.