Deltarune

Deltarune (PC, 2018) has code that decompiles almost back to source, deltamodders/deltamodkit, and 4 other public projects, including a decompilation.

Data checked 2026-10-12 · unbaked registry

PortMaster GameMaker

Projects

deltamodkit

Readable bytecode36 starspushed 2026-09-17no license

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.

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; no GitHub releases; repo created 2025-06-29

DeltaruneDecomp_beta

DecompUndertaleModTool26 starspushed 2025-10-17no license

DELTARUNE Decompilation

DELTARUNE Decompilation; repo created 2025-06-06

DeltaruneDecomp

Readable bytecode22 starspushed 2026-04-18no license

Deltarune via UndertaleModTool (GML bytecode)covers 4 games

Readable bytecodeGameMaker Studio 2 VM bytecode; UTMT2,077 starspushed 2026-09-07GPL-3.0 licenserelease 0.9.2.0

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

GitHub

PortMaster port 'deltarune'

Readable bytecodeGameMaker (data.win) run on ARM Linux via gmloader/gmloader-next (And…

Commercial/indie or freeware GameMaker game packaged in PortMaster (main) as deltarune, updated 2026-08-10; needs user game files

What you need

You need your own copy of the game: these projects ship code only.

Same toolchain

GameMethodYearStarsLast push

DOSDoomSource releaseMatching decomp+8199320k2026-10-12 DOSCommand & ConquerSource releaseReimplementation+2199518k2026-10-12 WEB2048Source releaseReimplementation+1201413k2026-08-19 PC2048 PlusReadable bytecode13k2024-10-24 PCMinecraft: Java EditionReimplementationSource port+220117.6k2026-10-11 PCBattle for WesnothSource release20056.9k2026-10-12 DOSQuakeSource releaseMatching decomp+419966.1k2026-10-12 PCThe Elder Scrolls III: MorrowindReimplementation20026.6k2026-10-12

More on PC

GameMethodYearStarsLast push

PCMindustrySource releaseAgent environment201929k2026-10-11 PCosu!Source releaseReadable bytecode+1200719k2026-10-12 PCCommand & Conquer Remastered CollectionSource release202021k2025-01-16 PCRollerCoaster Tycoon 2ReimplementationAgent environment200216k2026-10-12 PCDune 2000Reimplementation199818k2026-10-11 PCAge of Empires IIReimplementation199914k2026-10-03 PCCataclysm: Dark Days AheadSource release201313k2026-10-12 PCCivilization VSource releaseReimplementation201011k2026-10-12

Found via SubmitGame/awesome-decomp-games, search?type=repositories&q=decomp+in%3Aname+crea, en.wikipedia.org/wiki/GameMaker, store.steampowered.com/app/1671210/, PortsMaster/PortMaster-New/tree/main/ports/delta

GitHub data checked 2026-10-12. Notes are summaries from the research pass; the project pages are the authority.