A solid 
Citra continuation for any system citra was available for. It is a common work from 
Lime3DS team and PabloMk7 who also maintained a popular and great citra fork known as 
Citra MK7's fork .
THE WiiU emulator ! For Windows and linux ! An unofficial Android port is in early development with impressive results (it start to get almost fairly usable)
The best Ryujinx fork. It brings some QoL and bugfixes for Ryujinx. Might works better than Yuzu's forks for multiple games as it focus on getting better accuracy.
Worth mentioning: 
Kenji-NX
The best Yuzu continuation project.
Mainly the 
Citron team without the jerk. Unlike many Yuzu forks like 
Suyu it did bring some improvment regarding performance, optimization and compatibility. The team has been working with the torzu team and Sudachi dev.
Note that Citron still perform better in several areas
My favorite PSX emulator ! It runs on macOS, Windows, Linux and Android. The Android version often lacks the latest and greatest features especially on the PlayStore, consider GitHub sources on Android.
THE PS3 emulator, runs on Windows and Linux. It has improve a lot and is really impressive now with a lot of games labeled as "in-game" that will run from start to finish with a pleasant experience!
An Android-specific fork of RPCS3. Start to be interesting but not really playable in most titles.
We're getting here ! It's still in early stage, don't expect much of theses for now
THE PSP emulator ! Works on macOS, Windows, Linux, Android, iOS and more The PPSSPP Gold is for supporting the devs so buy it if you like it !
The first PS Vita emulator and the only one that can run commercial games that I'm aware of. Still experimental !
A modded version of the controversial 
GameHub (PC games on Android) that removes unnecessary permissions, limit telemetry and proxies your connection through their servers (you can selfhost the server yourself)
To emulate Windows (or Linux) on Apple devices
Worth mentioning if you need better performance: 
Parallels Desktop mac only
A great OG Xbox emulator for macOS, Windows and Linux with now support for Vulkan, which has not bring impressive optimization yet but that we could see improving in the future.
THE 360 emulator ! Only on Windows, but can run on Linux through Wine/Proton !
There is a front-end named 
Xenia Manager that makes the installation, configuration and usage easier. It is still early and a bit buggy using but a promising project to make the emulation easier for non tech savy people. And it did improved since the first time I tried it.
Another option is 
X360 Manager
These are translation-layer similar to Wine/Proton for Windows 10/11.
Currently only https://alternativeto.net/software/windurango/about/ is publicly available and only works with Minecraft.
The best way to emulate Xbox One and older is using an Xbox Series.
The GX version works great for macOS, Windows, Linux, Android and iOS
Worth mentioning : 
Kega Fusion
Ymir is a very promising Sega Saturn emulator that might just become the standard in the comming years.
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