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Using open source code is especially beneficial if a project is going to scale or if there is a need to transfer the mHealth digital health technology to a government. With open source code, governments can directly copy and customize pre-existing code and set-up their own servers without having to pay for licensing fees, use, or distribution of the software. This ensures that local software developers in a country can take ownership of a code base, and can be important for the long-term sustainability of a large-scale mHealth project.
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You can find more detail about the CommCare code base in on the Advanced Open Source section of the CommCare help site and find the code on githubDimagi website.