Apps similar to jgenesis include Ares Emulator, which is free and open source. Other options are Mesen and ClownMDEmu. In total there are three Game Emulators like jgenesis for Windows, Linux, Mac and the web.
ares is a multi-system emulator that began development on October 14th, 2004. It is a descendent of higan and bsnes, and focuses on accuracy and preservation.
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Mesen is a multi-system emulator (NES, SNES, Game Boy, PC Engine, Master System/Game Gear) for Windows, Linux and macOS built in C++ and C#.
It also includes an extensive set of debugging tools for homebrew development and romhacking.
Sega Mega Drive/Genesis and Sega CD emulator. It is designed as a modular project, consisting of a portable emulation core written in C and a feature-rich standalone frontend built with C++, SDL3, and Dear ImGui. You can try ClownMDEmu in your web browser at clownmdemu.clownacy.com.
