Easy Paint Tool SAI
Created by the Japanese company Systemax Software, SAI is one of the go-to softwares for many indie artists. It’s a lightweight and compact tool, and unlike other digital painting tools, it doesn’t greedily hog all of your RAM/CPU.http://www.clipstudio.net/en/purchase/trial
http://www.hongkiat.com/blog/painting-apps-for-digital-artists/
