Krita
About this software:
Zoom: Krita
Krita screenshotKrita is a free and open source painting tool designed for concept artists, illustrators, matte and texture artists, and the VFX industry. Krita has been in development for over 10 years and has had an explosion in growth recently. It offers many common and innovative features to help the amateur and professional alike.
From The Krita team:
Version 4.4.3 is a freeware program which does not have restrictions and it s free so it doesn t cost anything.
Virus and Malware Tests: The program has been tested with several antivirus applications and has tested clean of viruses, malware or trojans.