Editors' Review for Leonardo
Leonardo is still in beta. It starts in less than half a second and runs smoothly to paint with a large brush in really high resolution. Also, you can export to PSD with layers in which keeps layer information like name, blend mode, opacity and clipping masks. The feature is available that cut-copy-paste to other apps or between different Leonardo documents.
It supports pen pressure, multi-touch and the easy-to-use interface that will scale to any screen. It has a powerful brush engine that allows you to create beautiful brush strokes with minimum latency.