Krita - is a free and open-source raster graphics editor designed primarily for digital art and 2D animation + vector graphics
GIMP - photo retouching, image editing, free-hand drawing
Paint.net - image and photo editing
MyPaint - is best known as being an open-source alternative to Adobe Photoshop and GIMP
OBS Studios - video recording and live streaming
CapCut - easy-to-use video and photos editing tools
https://www.canva.com/online-whiteboard/flowcharts/
https://www.youtube.com/watch?v=TWxl3lsbZZk