Saw post on a different site asking what everyone's first digital art software was. I instantly became a dinosaur again. Personally; New Tek's Digi-Paint Professionally: Not sure want it was called, but it was on a Xerox SPARC Alto machine and used a puck to define points (not a mouse, a puck) for vector line work. Both would be in the mid to late 80s. The Apple LISA was a huge upgrade back then.