Visual Assembler - Commodore 64 & C64U
C64 Visual Assembler is a desktop application that lets you learn and write Commodore 64 machine code programs visually
JC64dis
JC64dis (next generation C64 disassembler)
Homegirl Pro
A fantasy console inspired by the Commodore Amiga
XSidplay2
Sid Player
LSS Game Contruction Kit
Game Construction Kit for Little Sara Sister C64 game
CmOS
CmOS is an open source operating system that runs in an exe!
Retro Pixel Art Sketch Pad
Retro pixel art doodling for all game devs
Sprite Studio 64 - Native sprite editor for C64
Native sprite editor for Commodore 64 computer.
Graphic Adventure Assembler for Commodore 64
A tool to make simple graphic adventure games for the Commodore 64
SNasm Assembler
A Z80, Z80n, 6502, 65c02, 65816, 45GS02 macro cross assembler
crustyBASIC - a BASIC cross-compiler for retro machines
Write BASIC... run it FAST on your retro systems!
Master of Sprites - sprite editor for commodore 64 sprites
Java editor for C64 sprites. Alternative for free version of SpritePad.