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1. UnderminersTeam/UndertaleModTool UnderminersTeam/UndertaleModTool Public

   The most complete tool for modding, decompiling and unpacking Undertale (and other GameMaker games!)

   C# 1.2k 223

2. UnderminersTeam/Underanalyzer UnderminersTeam/Underanalyzer Public

   GML VM analysis and decompiler library.

   C# 16 4

3. Rupitian/diannex Rupitian/diannex Public

   A text and dialogue language, designed to assist in the creation of scenes and localization for games

   C++ 10 1

4. DogScepter DogScepter Public

   A work-in-progress modding tool geared toward UNDERTALE/DELTARUNE

   C# 45 15

5. utonlineserver utonlineserver Public

   Some test server code for implementing multiplayer functionality into Undertale (or other basic GameMaker games)

   Java 4 2

6. gms14-roomviewer gms14-roomviewer Public

   A room viewer and unpacker/decompiler for Gamemaker: Studio 1.4 games. Written in GMS 2, and ported to GM:S 1.4.

   Game Maker Language 9 1