Natron is an open source, cross platform nodal compositing application. It is built around industry standard open source tech such as OpenFX, OpenEXR, OpenColorIO and OpenImageIO. The feature set includes realtime playback/RAM cache, multi-threaded rendering, 2d tracking, rotoscoping, grading, animation via f-curves and 3rd party OpenFX plugin support. All contained within a familiar, intuitive interface with an XML based project file format.
- Awful documentation (blank page); The versions change so much that the old tutorials don't help at all; Difficult to learn by just messing around; High learning curve.
- A Node based approach for not only vector and raster image processing and animation but also for OpenGL effects and shader authoring. Also supports OFX. Mainly targeted for VFX compositing.
- Its simple (when you get the arrangement) but still very powerful, easily works with Blender and its free!!