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.
Official releases are available from the ares website.
Automated, untested builds of ares are available for Windows and macOS as a pre-release. Only the latest nightly build is kept.
To build Ares from source, first ensure the following dependencies are installed (Debian/Ubuntu package names): build-essential libsdl2-dev libgtksourceview2.0-dev libgtk2.0-dev libao-dev libopenal-dev.
Then, run ./build-linux.sh.
The resulting build artifact will be found in desktop-ui/out/.