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

Board support

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

• Qualcomm® Robotics RB5 Development Kit
• RB3 Kit for DragonBoard 845c
• Khadas VIM3 / VIM3L
• Snapdragon(tm) 8 Gen 2 Mobile Hardware Development Kit (HDK 8550)
• Hikey 960

Baylibre have support packages for

• MediaTek MT8365 (i350): https://baylibre.pages.baylibre.com/mediatek/rita/device/mediatek/boards/mtk-android-14/index.html
• Texas Instruments: https://baylibre.pages.baylibre.com/ti/android/doc/ti-android-15/index.html

Other projects:

Generic Qualcomm SDM845 device support: https://github.com/aospm/android_device_generic_sdm845

• support for several handsets based on the SDM845

Generic HALs

• 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

Distros

LineageOS: https://lineageos.org/ - a free and open-source operating system for various devices, based on the Android mobile platform.