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hardened_malloc
Hardened allocator designed for modern systems. It has integration into Android's Bionic libc and can be used externally with musl and glibc as a dynamic library for use on other Linux-based platforms. It will gain more portability / integration over time.
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Apple is just as bad with the tracking, and even more walled-off on the propitiatory scale than the rest (hardware included.) Depending on your phone, you might want to think about switching to Lineage OS or if you own a Pixel, there is also GrapheneOS. I am considering it.