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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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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
There are a lot of misconceptions around the OS - that it's only for the most paranoid and thus lacks things like notifications/app support (not true, see the Sandboxed Play services compatibility layer for example) and performance (hugely overstated, misinfo likely stemming from a misleading video by a YouTube influencer). So all I'd say is, as with all claims you read on reddit or hear on YouTube: take criticisms of GrapheneOS with a grain of salt, and don't forget that you can always ask questions directly to the community or read the project's extremely detailed and clear website and Twitter feed for clarification.
To download the apk: https://github.com/GrapheneOS/platform_external_Camera/blob/12/prebuilt/Camera.apk