Quack

Quack is a project that DuckLabs, the company behind the analytics database DuckDB, has been building alongside its other work. DuckLabs has said it hasn't just built DuckDB — the analytics database that runs right on your laptop — but has also developed a related project called DuckLake together with Quack. The company refers to these three projects together as the "duck stack."

What matters here is that Quack will stay open going forward. Even as DuckLabs becomes part of Amazon Web Services (AWS), the company has emphasized that the open-source components of the duck stack — including DuckDB, DuckLake, and Quack — will keep their MIT license, which anyone can freely use, and that ownership will continue to rest not with the company but with the nonprofit DuckDB Foundation.

Articles tend to mention it briefly as a sibling project to DuckDB, in phrasing like "they've also developed projects called DuckLake and Quack." It's easy to mistake Quack for DuckDB itself, but the two are separate projects with different names.