jones_supa writes: Back in 1995, University of California students Peter Mattis and Kimball Spencer were members of the eXperimental Computing Facility, a Berkeley campus organization. In June of that year, the two hinted at their intentions to write a free graphical image manipulation program as a means of giving back to the free software community. On November 21st, 20 years ago today, Peter Mattis announced the availability of the "General Image Manipulation Program" on Usenet (later "GNU Image Manipulation Program"). Over the years, GIMP amassed a huge amount of new features designed for all kinds of users and practical applications: general image editing, retouching and color grading, digital painting, graphic design, science imaging, and so on. To celebrate the 20th anniversary, there is an update of the current stable branch of GIMP. The newly released version 2.8.16 features support for layer groups in OpenRaster files, fixes for layer groups support in PSD, various user interface improvements, OSX build system fixes, translation updates, and more.