Media Codecs & Containers (File Formats): open-source projects that exist because someone reverse engineered a closed product, sorted by GitHub stars.
Multimedia framework with many reverse-engineered proprietary codecs and containers
Independent clean-room E-AC-3 JOC decoder in Rust, with OAMD metadata and reconstruction-basis decoding.
Reverse engineered aptX and aptX HD audio codec
Tool to identify MQA encoded audio via codec reverse engineering
Partial reverse engineering of the Samsung Seamless Codec (SSC) Bluetooth audio codec
Library for Blu-ray disc navigation, playlists and menus
Library for DVD-Video menu navigation
Library for reading DVD-Video discs and IFO structures
Library for decoding RAD Game Tools Smacker video files