PixelConduit is an app that I've been working on for a long time. It used to cost $199, but for this new 3.0 release I've decided to change tack and make it completely free.
Also included in this release is a set of plugins for common video apps like Final Cut Pro, After Effects, Motion and even Photoshop. These plugins allow you to use the node-based UI to create your custom filters inside the host app.
Here's a small blog post outlining why I decided to go free:
http://lacquer.fi/blog/2013/01/conduit-reaches-version-3-0-a...