Apps similar to Fluid Paint include Krita, which is free and open source. Other options are MyPaint, PaintTool SAI, Artrage and Rebelle. In total there are six Digital Painting Tools like Fluid Paint for Windows, Mac, Linux, iPad and Android.
Free, open-source painting software designed by artists for artists. Offers customizable UI, 9 brush engines, color management, tablet support, non-destructive editing, and privacy features. Portable and available on major platforms, supporting seamless texture creation.
Netherlands
EU
MyPaint is a fast, distraction-free, and easy painting tool for digital artists. It supports graphics tablets made by Wacom, and many similar devices.
Switzerland
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.
Japan
A simple but lovely natural media painting and sketching program. Art oriented, but capable of loading/saving photoshop files.
United Kingdom
Emulates realistic watercolor, acrylic, and dry media with physical paint diffusion, drying control, textured canvas, custom brushes, tilt and pressure support, color blending, masking tools, paint granulation, backruns, stencils, rulers, and high-res export.
SlovakiaEU
Hong Kong SAR China
