Other (File Formats): open-source projects that exist because someone reverse engineered a closed product, sorted by GitHub stars.
Unofficial CLI to edit CapCut and JianYing project files
Python reader of LabVIEW RSRC files (VI, CTL, LLB)
Converts Cisco Packet Tracer .pka/.pkt files to XML
Viewer and parser for WinCC Flexible and TIA Portal data log files
Exports data from Samsung KIES backup (SBU) files
Extracts travel data from airline, rail and event tickets, including proprietary barcode formats
Reverse-engineered specification and parser for HBK Perception PNRF measurement files