I have released a new 2D painting application. The new thing is built in 3 point perspective support, with straight line and freehand drawing in perspective.
The perspective of the image is defined in the application by rotating a 3d scene:
Once the perspective is defined a 3D cursor is drawn on the image, indicating where the vanishing points are.
To draw a straight line in perspective you simply select one of the vanishing points with a key on the keyboard and draw as usual. By selecting two vanishing points you enter freehand mode and paint in the selected perspective plane.
You can download Harry Storbacka's Digital Artist from http://www.da-gfx.com/. HSDA is "pay what you want" for non-commercial use. For commercial use a licence has to be bought.
To see what else it can do, check out the features page.
Have fun with it! As this thing has just been released, I'm very interested in your opinions about it. All feedback is appreciated!