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All the retro development resources you need in one place.
C64-Wiki
Wiki
The C64-Wiki is a project to build a special C64 encyclopedia. There are over 1,500+ articles of various topics.
C64 Studio
IDE
C64 Studio is a .NET based IDE. The program supports project based C64 assembly or Basic V2. Includes many other features. Debug through your code and watch variables/memory locations, registers and memory. Any other emulator can be set up as well if it's startable via runtime arguments. C64 Studio allows you to compile to raw binary, .prg, .t64, .d64 or cartridge format (.bin and .crt for 8k, 16k, MagicDesk). Additionally to this C64 Studio comes with a charset, sprite and media editor (tape and disk). An encompassing help documentation is part of the program.
N64 SDK Guide
Guide
A fantastic series of in-depth tutorials by n64squid.com - Warning, not for the faint of heart.
Libdragon
Library
An open-source library for N64 development. Intro line: A simple library for N64 that allows one to code using the GCC compiler suite and nothing else. No proprietary library is needed.
Banjo’s Backpack
Level Editor
Banjo’s Backpack is a visual level editor that allows you to create new levels for Banjo-Kazooie.
Hylian Toolbox
Level Editor
Hylian Toolbox is a compact tool for OoT and MM that allows for the creation of custom hierarchies, animations, matrices, and maps. It is the only tool that is capable of creating custom hierarchies and mapping vertices from one limb to another. It is also the only tool that can set collision information based on groups and create hierarchies.
cc65
Compiler
cc65 is a complete cross development package for 65(C)02 systems, including a powerful macro assembler, a C compiler, linker, librarian and several other tools.
Programming NES games in C
Tutorial
This article is aimed to the people who would like to start NES software development, but aren't yet ready to get into programming large projects in 6502 assembly, and seeking for an easier, high level alternative. It covers many topics related to programming NES games in C using CC65 compiler, with a specially developed simple game provided as an example.