There are 2 repositories under 65816 topic.
A language-agnostic JSON-encoded instruction-by-instruction test suite for the 8088, 68000, 65816, 65[c]02 and SPC700 that includes bus activity.
An Apple IIgs Emulator and Debugger written in C/C++ for Windows, Linux and macOS
The WE816 is a 16-bit 65816 based system with 512K of System RAM, 96K of System ROM, 32K of video RAM, a TMS9918 graphics processor and an AY-3-8910 Sound chip. The system runs a custom version of BASIC and supports commodore compatible IEC disk drives.
Adds syntax highlighting to 65816/65C816/65802/6502/65C02 files in Atom, with extra support for various compilers.
WIP: A toy SNES emulator written in Go.
An "initial" ANSI(ish) Forth for the W65C265SXB SBC (65816 CPU)
Video Game Music Player for C256 Foenix
OS-free, tool-free, accurate vt100 emulator for the Apple IIgs
WLA Assembly (6502, 65C02, 65816) syntax highlighting
decompression code for Deflate in 65c816
Original SNES Star Fox source code restored to produce 1:1 retail ROM releases on compile
65c816 assembly code I've written for Super Mario World ROM hacks