Retro
SID Factory II is a cross-platform editor for composing music that will work on a Commodore 64. It uses the reSID emulator and is currently in open BETA.
Tools and Utilities for the MEGA65 Retro Computers
A very simple "Hello world" for Mega65 which displays rasterbars.
This project is no longer actively developed. See https://github.com/llvm-mos/llvm-mos ! An experimental LLVM target for the 6502 family of microprocessors. Note that generated assembly is not 6502…
Millfork: a middle-level programming language targeting 6502- and Z80-based microcomputers and home consoles
Emulations (running on Linux/Unix/Windows/macOS, utilizing SDL2) of some - mainly - 8 bit machines, including the Commodore LCD, Commodore 65, and the MEGA65 as well.
A more modular rewrite of most components from VGMPlay. will include sub-libraries for audio output, sound emulation and VGM playback
VGM file command-line player and Winamp plugin.
A Commodore 64 demo with scrolltext and bitmap for internal talk on tretton37.
Port of LLVM to the MOS 6502 and related processors
A gathering point for community created software examples for the MEGA65.
cc65 library for accessing the DOS and network functions of the Ultimate II+ cartridge and Ultimate 64 motherboard
Improved version of the 1541 Ultimate II(+) firmware
The source from my Commodore 64 assembly programming tutorial for Windows
Python script that converts PNG files into SPD sprite data for C64
Some tools to process C64 sprites and tilesets
spritemate is a browser based sprite editor for the Commodore 64
C64 Assembly collection. Including custom assembler and demo engine
create, extract and convert 8-bit Commodore binary archives
Rust library for interfacing with Ultimate-64 and Ultimate-II+
Library to create Text interfaces on the Commander X16 by writing directly to the VERA
Commander X16 music player engine and frontend using the new audio API