Persistence? No kidding!
POV-Ray - The Persistence of Vision Raytracer 3.5 is out after 2 years of development. Don't know why they didn't bump the version up to 4... most apps that have been around for more than 10 years have higher versioning by now. My first POV experience dates back to around '93-'94-ish. Team POV-Ray just doesn't know when to quit!