Sources were originally provided at https://github.com/librefonts/antic in .sfd format (FontForge) and the latest version in that format is available at commit 928c13650dfb95b24baa3eb44edefadec9635423.
On 1 Jul 2026, the sources were converted to .glyphs format using babelfont-rs in a new repo hosted at https://github.com/googlefonts/antic