Version
4.0.0 of the darktable raw photo editor has been released.
“The UI has been completely revamped again to improve look and
consistency. Padding, margins, color, contrast, alignment, and icons have
been reworked throughout“. Other changes include new exposure and
color-calibration modules, a reworked “filmic” color-mapping module, guided
laplacian highlight reconstruction, and more. (LWN looked at darktable in January).

Source: LWN.net – Darktable 4.0.0 released