The most complete tool for modding, decompiling and unpacking Undertale (and other GameMaker games!)
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Updated
Sep 7, 2026 - C#
The most complete tool for modding, decompiling and unpacking Undertale (and other GameMaker games!)
The best working and fully optimized GML runner in C for the Nintendo 3DS and Wii U.
🥧 An open source re-implementation of GameMaker: Studio's runner (YoYo Runner)
Uma tradução PT-BR do jogo DELTARUNE, originalmente feita pela TEIARRUMA. Traduzidos Cap1-5. Levará meses.
DELTARUNE 中文本地化补丁
Independent 1:1 DELTARUNE Engine made in GameMaker Studio
A tool to convert DELTARUNE Chapter 1&2 save files between PC and console editions of the game.
An unofficial port of DELTARUNE for Linux!
A work-in-progress modding tool geared toward UNDERTALE/DELTARUNE
Mod Manager for GameMaker games!
Unofficial port of the DELTARUNE game to the Nintendo 3DS
Український переклад гри DELTARUNE від перекладацької спілки Pereclaw.
Static site for viewing Undertale/Deltarune game scripts made so we have a site to reference when citing code on Undertale/Deltarune Wiki (original by xkeeper).
A GameMaker-compatible mod manager
To associate your repository with the deltarune topic, visit your repo's landing page and select "manage topics."