Krita– Krita offers CMYK support, HDR painting, perspective grids, dockers, filters, painting assistants, and many other great features
GIMP – GIMP is a well known free alternative to Photoshop with similar features
Mischief Free Version – With six essential brushes, a basic palette of colors and an infinite vector canvas, Mischief-Free is perfect for hashing out ideas, life drawing, and endless doodles
MyPaint – MyPaint is a fast and easy open-source graphics application for digital painters, and comes with 39 different brushes
3D Modelling
Google Sketchup – Drawing-based tool for architects, designers, builders, makers and engineers who design for the physical world. SketchUp Make is a free version and SketchUp Pro is a paid version with additional functionality.
Sculptris– A free, introductory digital sculpting tool, a great stepping stone for digital sculptors, created by the makers of Zbrush.
Blender – A powerful application with full-fledged professional tools, Blender has a wide community and resources to help you learn.
Animation
Synfig – Synfig Studio is a free and open-source 2D animation software, designed as powerful industrial-strength solution for creating film-quality animation using a vector and bitmap artwork.
ToonBoom Animate PLE Edition – The free Personal Learning Edition gives you the opportunity to learn all the features of Toon Boom Animate and Toon Boom Animate Pro.
EmoFuri – EmoFuri is a new animation software that helps artists easily animate photoshop illustrations in a 2D-3D style! It uses PSD files of character illustrations to animate them.
Etc
Thisissand – An online fun and unique playground for creating colourful sandscapes, also comes in an app version
Flame Painter – A free demo of the full program, it allows you to try out the flame generator and change different brush settings and paint your own flame paintings
Silk – An online interactive generative art program that creates bright silk-like patterns, with options to change colours and rotational symmetry.
Bomomo – This interesting program has a group of dots that move around the screen in the pattern you choose, then paint the canvas according to when you click the screen.
gamerfreakathon 