Liquid Studio is described as 'product born from TwistedBrush Pro Studio but with a focus on creation of individual objects that you might use in other Pro Studio or other art software and with a simpler, streamlined interface' and is a Digital Painting Tool in the Photos & Graphics category. There are more than 10 alternatives to Liquid Studio for a variety of platforms, including Windows, Mac, Linux, iPhone and Android Tablet. The best alternative is Krita, which is both free and Open Source. Other great apps like Liquid Studio are Paint.NET (Free Personal), MyPaint (Free, Open Source), Clip Studio Paint (Paid) and PaintTool SAI (Paid).
Krita is a professional Free and open source (FOSS) painting program. It is made by artists that want to see affordable art tools for everyone withith concept art, texture and matte painters, illustrations and comics.
MyPaint is a fast painting program with an emphasis on full-screen use. It lets you focus on the art instead of the program. You work on your canvas with minimum distractions, bringing up the interface only when you need it.
PaintTool SAI is high quality and lightweight painting software, fully digitizer support, amazing anti-aliased paintings, provide easy and stable operation, this software make digital art more enjoyable and comfortable.
Corel Painter is a raster-based digital art application created to simulate as accurately as possible the appearance and behavior of traditional media associated with drawing, painting, and printmaking.