PC Paintbrush is graphics editing software created by the ZSoft Corporation in 1985 for computers running the MS-DOS operating system.It was originally developed as a response to the first paintbrush program for the IBM PC, PCPaint, which had been released the prior year by Mouse Systems, the company responsible for bringing the mouse to the IBM PC for the first time.In 1984 Mouse Systems had released PCPaint to compete with Apple Paint on the Apple II computer and was already positioned to compete with MacPaint on Apple Computer's new Macintosh platform.