aosp-devs.org

There are many projects that extend AOSP in various ways. Here we divide them into:

Board support: the code required to allow Android to run on a given board or family of boards
Generic HALs: hardware support that applies to multiple boards
Android distros: modifications to the Android framework and applications
Open source apps: apps that can replace functionality that exists in Android, but not AOSP

Code search

To search the AOSP source code, you can use Android Code Search provided by Google.

To see the differences between Android releases, you can use Android Open Source Project Changelogs provided by the github repo.

The Devboards for Android project https://devboardsforandroid.linaro.org/en/latest/ adds support to upstream AOSP for several boards including:

BayLibre have support packages for

Other projects:

Generic Qualcomm SDM845 device support: https://github.com/aospm/android_device_generic_sdm845
- support for several handsets based on the SDM845

drm_hwcomposer https://gitlab.freedesktop.org/drm-hwcomposer/drm-hwcomposer - DRM/KMS based HWComposer implementation used on many devices
Force Feedback haptics hal: https://github.com/aospm/external_vibrator-ff - A generic haptics HAL which supports drivers using the force feedback API via input class devices.
TinyHAL audio HAL: https://github.com/CirrusLogic/tinyhal - Generic Audio HAL on top of tinyalsa and tinycompress. Configured via XML
Lights HAL: https://github.com/SoMainline/android-lights-hal - control for backlight and LEDs
Keymaster/Gatekeeper on OP-TEE: https://github.com/linaro-swg/kmgk
Camera: https://libcamera.org/index.html

LineageOS: https://lineageos.org/ - a free and open-source operating system for various devices, based on the Android mobile platform.
Replicant: https://replicant.us/ - an attempt to get rid of all non-open components. While it has fallen far behind upstream, it has some interesting beginnings and starting points of open drivers and firmware
GrapheneOS: https://grapheneos.org/ - Security and privacy minded AOSP fork for Pixel devices
CalyxOS: https://calyxos.org/ - Privacy minded fork of AOSP with MicroG support
/e/ OS: https://e.foundation/e-os/ - Privacy minded LineageOS fork
GloDroid: https://glodroid.github.io/ - AOSP distro for Orange Pi and other boards
Project Celadon: https://projectceladon.github.io/celadon-documentation/getting-started/getting-started.html - AOSP distro for Intel platforms, virtual machines and containers source
Projects by BlissLabs:
- Waydroid: https://waydro.id/ - A container-based approach to boot a full Android system on regular GNU/Linux systems running Wayland based desktop environments.
- BlissRoms: https://blissroms.org/ - BlissRoms, an open-source operating system built upon Android Open Source Project, that offers a harmonious blend of customization, options, and security features.
- BlissOS: https://blissos.org/ - An Android-based open source OS that incorporates many optimizations, features, and that supports many more devices. What’s more? It’s available for just about any Chromebook, PC or tablet released in the last 10 years.

COVESA AOSP SDK - initiative to standardize vehicle interfaces for application developers. More about COVESA - here.