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1. facebook/react facebook/react Public

   The library for web and native user interfaces.

   JavaScript 245k 51.1k

2. microsoft/TypeScript microsoft/TypeScript Public

   TypeScript is a superset of JavaScript that compiles to clean JavaScript output.

   TypeScript 109k 13.4k

3. ibm-cics-banking-python ibm-cics-banking-python Public

   IBM CICS Banking re-architecture: 29 COBOL programs (27,300 lines) → ~1,300 lines Python/FastAPI/SQLite + web UI

   COBOL 1

4. cobol-galaxian cobol-galaxian Public

   Galaxian (1979) arcade clone in GnuCOBOL + ncurses — 755 LOC COBOL, terminal graphics, 30 FPS

   COBOL

5. openvista-explorer openvista-explorer Public

   Web-based VistA/MUMPS global explorer — browse VEHU data, view raw globals, write to live MUMPS

   Python 2 2

6. rpg-chess rpg-chess Public

   Chess engine in RPG IV free-format. Negamax alpha-beta, ~420 lines. First chess engine ever written in RPG.

   RPGLE