Drawing

Real open source development

Used it since before the first release. Easier to lean than Illustrator (which i first used in 1998), libre/free, open source, standards-based, works on Linux.

ibis Paint X is a versatile drawing app which provides over 15000 brushes, over 7600 materials, over 1000 fonts, 80 filters, 46 screentones, 27 blending modes, recording drawing processes, stroke stabilization feature, various ruler features and clipping mask features.

Blown away by the live simulation as you paint wet. Incredibly intuitive. Beautiful software with a perpetual license and fantastic support team. I may add more later, I was just surprised Rebelle 5 wasn't on the list so had to add it...

A pixel art editor that is available in a free and a Pro version, it can be used on mobile and desktop with Google Drive sync.

Great to visualize, share, and collaborate on CAD files

Lorien is a simple free and open-source Whiteboard with an infinite canvas. It is still in its early stages, but looks very promising.

free app the best in gamedev.

Draw.io is a free web based diagramming and mind mapping software.