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

🥧 An open source re-implementation of GameMaker: Studio's runner (YoYo Runner), targeting Undertale v1.08 (WAD Version 16)

Uma tradução PT-BR do jogo DELTARUNE, originalmente feita pela TEIARRUMA. Traduzidos Cap1-4. Traduzindo Cap5. Levará meses.

The best working and fully optimized GML runner in C for the Nintendo 3DS and Wii U.

DELTARUNE 中文化补丁安装器

DELTARUNE 中文本地化补丁

Independent 1:1 DELTARUNE Engine made in GameMaker Studio

Generate Undertale/ Deltarune sprite textboxes with typewriter functionality!

A recreation of Deltarune's combat system in Godot

A tool to convert DELTARUNE Chapter 1&2 save files between PC and console editions of the game.

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

Mod Manager for GameMaker games!

[The Smooth Taste Of] NEO

An unofficial port of DELTARUNE for Linux!

Український переклад гри DELTARUNE від перекладацької спілки Pereclaw.

The most robust, feature-complete DELTARUNE GameMaker Studio 2 decompilation / port, enhanced with a multitude of tweaks designed to make the game easier to mod.

轻松创建《DELTARUNE》风格的对话动画！

DeltaTune ported to Linux

BadTime Simulator Reimagined (2026) is the premier utility for high-intensity boss fight simulation. Master your skills and precision with this secure, high-speed, and optimized combat experience.

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).