I don't consider Lean to be a process, but a relatively well-established way of thinking about things that can give people an interesting perspective on the process of software development. Having read the thread you pointed to, I suspect this is not what you are looking for.
Author of Lean Software Development, Implementing Lean Software Development, and Leading Lean Software Development
I’ve looked at a lot of different solutions, and in my humble opinion Aspose is the way to go. Here’s the link: http://aspose.com
subject: Implementing Lean Software Development: Another Software Development Process?