The Foundry Mari 1.3v2

Painting
UV-less workflow that gives the ability to adjust texture size on a per-face level allowing for near-limitless detail
Fully customisable brush engine
'Paint through' and 'clone from' between layers and textures (including 'clone from' on-surface)
'Slurp' brush for smearing and dragging texture
Paint canvas transform, grid warp and free-form 'pin' warp
Blur and sharpen, including on-surface, multiple UV patches simultaneously
Advanced 'healing' brush for seam removal and duplication of texture detail
Environment
Filters with real-time preview
Advanced channel masking engine, including mask painting, surface falloff, masking one channel to another, and by depth
Supports customisable real-time 3D shader preview (e.g. specular highlights, displacement preview via bump mapping, ambient occlusion, layer blending modes, colour correction and more
Customisable tool 'shelves' for brushes, colours, reference images, sharable between artist and projects
Floating point, 16 bit or 8 bit channels
All painting and shading tools are available in 3D projection paint mode and 'flat' UV paint mode
Background plates for reference
Imports multiple camera moves through which the model can be viewed
Spherical environment mapping to simulate a shiny reflective surface
Tiled textures with masking to quickly cover large areas on models
Models
obj model format support
Multiple objects, versions (e.g. high res or in key character poses), instances, with or without baked animation
Interactively handles very large 3D model data sets, scaling to over 1 million polygons for a single topology or mesh
Supports large textures up to 32K x 32K pixels
Handles thousands of textures per model, over many channels
Seamlessly supports hundreds of UV texture patches
Handles animated geometry and animated textures
Isolate, select, mask and hide geometry per patch and face
Customisable lighting and rendering modes
Massive geometry and texture data sets not limited by the amount of RAM
Dynamic tessellation shader that can preview displacement maps on geometry in real-time
Workflow
Linux or Windows
High quality turntable rendering
Flatten and round-trip projected textures for modifying externally (for example in NUKE or Adobe© Photoshop©)
Open and extensible approach to UI, geometry, camera, shading, and supporting light and texture exchange
Import and export as background tasks, allowing the artist to continue painting
Embedded web browser for quick access to community forum
Fully featured and open playtime colour management system
Filters with real time preview and fully featured colour correction
Save states for textures to have multiple versions that can be reverted back to later