C64SIDkit is a SID chip sound effects toolkit for Commodore C64 game development. The program is developed by Devin Venable and has the following features: Python SID emulation, JSON-based SFX patch format, SFX preset library, WAV preview/export, 6502 ASM export, Command-line tool, Pygame SFX Tweaker GUI and a Native C64 audition tool.