Retro development tools
FastBasic - Fast BASIC interpreter for the Atari 8-bit computers
a multi-system chiptune tracker compatible with DefleMask modules
A homebrew SDK/pseudo-operating system for the Sega Dreamcast. This repository is a mirror of the official SourceForge repository for KOS.
The most powerful open source SDK for the PS1 (as far as open source PS1 SDKs go). Not recommended for beginner use.
An updated version of GBDK, C compiler, assembler, linker and set of libraries for the Nintendo Gameboy, Nintendo Entertainment System, Sega Master System, Sega Game Gear.
a BASIC-like language for creating games that run on the Atari 2600 console.
IntyBASIC compiler for Intellivision (CP1610 processor)
BASIC language compiler for Colecovision, MSX, SG1000, Spectravideo SVI-318/328, Creativision, Sord M5, Memotech MTX, Tatung Einstein, Casio PV-2000, and Hanimex/Soundic Pencil II.
cc64 is a small-C compiler written in Forth, hosted on the Commodore C64, Plus4 and C16 with 64k, and on the Commander X16. It is targeting the 6502 CPU.
The cross-platform, open-source SDK to develop for original Xbox: *new* xdk
Homebrew development library for Nintendo 3DS/Horizon OS user mode (Arm11)
Full-featured Nintendo Virtual Boy game development application.
SGDK - A free and open development kit for the Sega Mega Drive
development kit and libraries for SEGA Master System / SEGA Game Gear / SEGA SG-1000 / SEGA SC-3000 homebrew programming using C language (and the SDCC compiler)
a BASIC-like language for creating games that run on the Atari 7800 console.
PVSnesLib : A small, open and free development kit for the Nintendo SNES
A curated list of awesome resources for 8-bit retro game development
Fortran based development framework for the Atari 2600 vintage console