Introducing Jpegli: A New JPEG Coding Library (Google Open Source Blog)

The Google Open Source Blog is carrying an
announcement for a new JPEG library called 'Jpegli'. There are a
number of advantages claimed, including:

Jpegli can be encoded with 10+ bits per component. Traditional JPEG
coding solutions offer only 8 bit per component dynamics causing
visible banding artifacts in slow gradients. Jpegli's 10+ bits
coding happens in the original 8-bit formalism and the resulting
images are fully interoperable with 8-bit viewers. 10+ bit dynamics
are available as an API extension and application code changes are
needed to benefit from it.

The library is BSD-licensed.