These are spin-offs of your program developed by others and marketed with your approval. Provided third parties don't intend to develop anything you have in mind, it is usually a good idea to encourage them. Make sure you retain sensible control through quality screening regimes and certification. The more people that have a vested interest in variations of your product, the more it will be publicized and sell. On the principle that where there's trade, there's life, third-party programs tend to extend the life of their parent.
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