Sources were originally provided at https://github.com/librefonts/bentham in .sfd format (FontForge) and the latest version in that format is available at commit a89643ad524f785a73f5326e6ee901fb042fa765.
On 1 Jul 2026, the sources were converted to .glyphs format using babelfont-rs in a new repo hosted at https://github.com/googlefonts/bentham