Gearcoleco (Source)
Gearcoleco is a very accurate cross-platform ColecoVision emulator written in C++ that runs on Windows, macOS, Linux, BSD and RetroArch.
* Accurate Z80 core, including undocumented opcodes and behavior like R and MEMPTR registers.
* Accurate TMS9918 emulation.
* Support for ColecoVision Super Game Module (SGM) and MegaCart ROMs.
* Support for Super Action Controller (SAC), Wheel Controller and Roller Controller.
* Save states.
* Compressed rom support (ZIP).
* Supported platforms (standalone): Windows, Linux, BSD and macOS.
* Supported platforms (libretro): Windows, Linux, macOS, Raspberry Pi, Android, iOS, tvOS, PlayStation Vita, PlayStation 3, Nintendo 3DS, Nintendo GameCube, Nintendo Wii, Nintendo WiiU, Nintendo Switch, Emscripten, Classic Mini systems (NES, SNES, C64, ...), OpenDingux, RetroFW and QNX.
* Full debugger with just-in-time disassembler, cpu breakpoints, memory access breakpoints, code navigation (goto address, JP JR and CALL double clicking), debug symbols, memory editor, IO inspector and VRAM viewer including registries, tiles, sprites and backgrounds.
* Windows and Linux Portable Mode.
* Rom loading from the command line by adding the rom path as an argument.
* Support for modern game controllers through gamecontrollerdb.txt file located in the same directory as the application binary.