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An example of those funding models is when bespoke software is developed as a consulting project for one or more customers who request it. These customers pay developers to have this software developed according to their own needs and they could also closely direct the developers’ work. If both parties agree, the resulting software could then be publicly released with an open-source license in order to allow subsequent adoption by other parties. There also exist stipends to support the development of open source software, such as Google’s Summer of Code. Another approach to funding is to provide the software freely, but sell licenses to proprietary add-ons such as data libraries.