openCanvas, popularly abbreviated as oC, is an art program for the Microsoft Windows operating system popular among Japanese digital artists. Portalgraphics, the company that created it, originally got it for free, but later this was changed and from version 2 it became a demo / retail model.

OpenCanvas is known for its original mixing mode when it comes to drawing or painting, a combination of Photoshop and Corel Paint. Unlike other programs, openCanvas is specifically designed to be used with tablets with sensitivity to pressure, such as Wacom's next-generation tablets. In principle the program was designed to be used for drawings, "sketches" or sketches rather than as a graphic editing program (There is a trial version available, which expires thirty days after installation).

wiki