http://www.blender.org/
http://www.anim8or.com/
http://www.wings3d.com/
http://www.artofillusion.org/
http://www.k-3d.org/
http://inkscape.org/
http://sodipodi.sourceforge.net/
http://www.gimp.org/
http://paint.net/
https://firealpaca.com/download/
http://mypaint.intilinux.com/
http://al.chemy.org/
http://mrdoob.com/projects/harmony/
https://www.pencil2d.org/
https://opentoonz.github.io/e/
https://www.synfig.org/
www.dragonbones.com/en/index.html
http://pbone.it-mate.co.uk/pivot.htm
Check out my new picture gallery and my favourite links