Camera Firmware (Firmware & Embedded): open-source projects that exist because someone reverse engineered a closed product, sorted by GitHub stars.
Reverse engineering Sony digital cameras: install apps via PlayMemories Camera Apps protocol
App to unlock hidden settings on Sony cameras
Alternative firmware for Xiaomi Yi cameras on Hi3518e chipsets
Firmware research tool that adds FL2/FL3 and custom looks to the Sony A7C II
Git-based Magic Lantern, open add-on firmware for Canon EOS cameras
Custom firmware for Yi 1080p cameras based on the Allwinner platform
Reverse engineering and custom code for Fujifilm cameras
Autoexec scripts and mods for the Xiaomi Yi action camera from firmware RE
Build Android apps for Sony PlayMemories-capable cameras
Tools from reverse engineering Nikon DSLR firmware (Nikon Hacker)
Custom firmware for the Sonoff GK-200MP2B camera
Unofficial modding tool to import presets into Ricoh GR IV Image Control
Firmware hacks for Linux-based Samsung NX mirrorless cameras
Modified firmwares for Aqara Camera Hub G2/G2H and Hub E1
Ricoh GR IV firmware analysis and feature expansion
Unofficial firmware tools for GoPro cameras
Magic Lantern install tool for Canon cameras over PTP
Sony PictureEffectPlus mod adding Ricoh GR colour profiles via PMCA
Hacks and custom firmware tooling for Ambarella-based action cameras including GoPro
FUSE filesystem for Magic Lantern MLV raw video files
Pure Java USB interface to Canon cameras running CHDK PTP
Firmware analysis console used for Magic Lantern Canon reverse engineering
RAW developer for Magic Lantern MLV formats
Firmware flash tool for Wyze cameras, used with OpenIPC
Python bindings for chdkptp to control CHDK Canon cameras
Cloud-free RTSP and ONVIF firmware mod for the LSC 1080p Anyka-based Tuya camera