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Natron 1.0.0 RC 3 nodal compositing software running on Ubuntu 15.04 linux
https://natron.inria.fr/

Natron is a free open-source, cross-platform compositing software. It aims to produce visual effects.

32 bits floating point linear colour processing pipeline.
Colorspace management handled by the famous open-source OpenColorIO library.
Dozens of file formats supported: EXR, DPX,TIFF, JPG, PNG…thanks to OpenImageIO.
Support for many free and open-source OpenFX plugins:
TuttleOFX : A suite of about 80 plug-ins made by a french studio named Mikros image.
OpenFX-IO to read anything else than standard 8-bits images (bundled with pre-compiled versions of Natron.
OpenFX-Misc : A set of basic nodes, such as Transform, chroma keyer, etc… (bundled with the pre-compiled versions of Natron.
OpenFX-Yadif deinterlacer : An open-source efficient de-interlacer.
OpenFX-Vegas SDK samples
OpenFX samples (in the Support and Examples directories)
Support for commercial OpenFX plugins: (these are proprietary software and not free)
Furnace by The Foundry
KeyLight by The Foundry
GenArts Sapphire
Other GenArts products

OpenFX v1.3 supported : almost all features of v1.3 are supported
Intuitive user interface: Natron aims not to break habits by providing an intuitive and familiar user interface. It is possible to separate on any number of screens the graphical user interface.
Performances: Never wait for anything to be rendered, in Natron anything you do produces real-time feedback thanks to its optimised multi-threaded rendering pipeline and its support for proxy rendering (i.e: the render pipeline can be computed at lower res to speed-up rendering).
Multi-task: Natron can render multiple graphs at the same time, it can also be used as a background process in command-line mode without any display support (e.g: for render farm purpose).
Recover easily from bugs: Natron sometimes crashes. Fear not, an auto-save system detects inactivity and saves your work for yourself. Also Natron provides the option to render a graph in a separate process, meaning that any crash in the main application would not crash the ongoing render (and the other way around).
Project format written in XML and easily editable by human.
Fast & interactive Viewer – Smooth & accurate zooming/panning even for very large image sizes (tested on 27k x 30k images).
Real-time playback: Natron offers a real-time playback with best performances thanks to its RAM/Disk cache technology. Once a frame is rendered, it can be reproduced instantly afterwards, even for large image sizes.
Low hardware requirements: All you need is an x86 64 bits or 32 bits processor, at least 3 GB of RAM and a graphic card that supports OpenGL 2.0 or OpenGL 1.5 with some extensions.
Animate your visual effects: Natron offers a simple and efficient way to deal with keyframes with a very accurate and intuitive curve editor.
Command line tool for execution of project files. The command line version is executable from ssh on a computer without any display. Hence it is possible to use a render farm to render Natron’s projects.

Rotoscoping: Edit your masks and animate them to work with complex shots
Tracker node: A new tracker embedded in Natron to track multiple points with different algorithms available.

Presets: Nodes presets can be imported/exported easily with an XML file format