A skunkworks project is a project developed by a small and loosely structured group of people who research and develop a project primarily for the sake of radical innovation.
It is an especially enriched environment that is intended to help a small group of individuals design a new idea by escaping routine organizational procedures. The research and development (R&D) workers in a skunkworks are usually specially selected, given special resources, and work on a crash basis to create an innovation.
What if there is no managerial approval, and one individual embarks on a (legal) project during their own time, in secret (since there is no formal approval) with the intent of bringing about radical innovation?
Is there a name for such a project?
Some successful examples would be interesting.