3D Painting Software for Linux
Blender
Blender is a free and open-source 3D model software released under the GNU General Public License. The software can be used for 3D modeling, 3D animation, UV unwrapping, texturing, rigging, skinning, rendering, particle generation, water simulation and much more.
Substance Painter
Substance Painter is 3D painting software developed by Adobe. With Substance Painter, you can easily work with smart materials, smart masks and integrated bakers, in a state of the art real-time viewport. Substance Painter is brings that Photoshop feeling to 3D painting.
3DCoat
3DCoat is that provides all the tools you need to take your 3D idea from a block of digital clay all the way to a production ready, fully textured organic or hard surface model. With 3DCoat, artists and designers can enjoy features for fast and friendly UV Mapping, east texturing and PBR, among other tools nessesary for 3D and texture painting.
Mari
Mari is a professional 3D painting software without limits, combining the power and performance to handle even the most complex assets with artist-friendly 3D paint tools that make the most of your creativity. With Mari, you can create amazing high-resolution digital 3D paintings and textures.
ArmorPaint
ArmorPaint is a a free 3D painting software specifically designed for physically-based texture painting. With ArmorPaint, you can paint with fully procedural materials, build fill layers with material nodes and use brush nodes to create patterns and procedural brushes. ArmorPaint supports up to 16K texture painting in seamless fashion using high-end graphics cards, which produce stunning results.