On android, I use either:

• FEX

Basically Proton, but for Android

• JoiPlay

For RPGMaker and Ren'py games

• PPSSPP

For PSP games

On Windows, I used to run CEMU, but it's been shut down by Nintendo.

Whatever Retro Game Corps recommends.

His guide has been great for my Retroid Pocket 5 (Android). For the Steam Deck I've basically used most of the stuff recommended by EmuDeck's installation wizard, but the Retro Game Corps guide is great for this as well.

My most used emulators have been:

1. Eden - Switch

2. PPSSPP - PSP

3. Dolphin - Wii

4. Azahar - 3DS

5. NetherSX2 (Android) and PCSX2 (PC) - PS2

I now play my favorite classic games in the browser: dos.zone

RetroArch for most stuff. The main devs aren't good people but the tech of it is good, and most of the cores are by other people than the main devs. Dolphin standalone for GC and Wii. PPSSPP standalone for PSP. Both of those don't run well through retroarch

Anything I'm not already familiar with in terms of what retroarch core to use, I'll check https://emulation.gametechwiki.com/index.php/Main_Page

That's the wiki for 4chans ongoing emulation threads.

I use Lemuroid on Android. Works well. On F-Droid. Nothing about it has prompted me to search for alternatives, so no idea how it stacks up against other options.

Also, EasyRPG Player on Android for RPG Maker games. (I played the original Yume Nikki not terribly long ago via EasyRPG Player.) Also on F-Droid. Also worked great.

If we're talking console emulators, pcsx2 for PS2, Duckstarion for PS1, mGBA for GBA, Dolphin for gamecube, Kega Fusion for all things Sega before Dreamcast, the standard stuff. All on computer and not my phone.

If we're talking some sort of other emulators, then IDK what to answer with besides the usual things people might say like the WINE or Proton compatibility layers.

I use PCSX2 for PS2, Nestopia for NES, Ares for SNES, Dolphin for GameCube, Sameboy for DMG and GBC, and likely will use Mednaffe (Mednafen frontend) for Saturn (I still have a Saturn hack of Asuka 120% I rarely play).

I game on Linux but these are all FOSS and multiplatform:

• DosBox-X - For my older Dos/PC games
• UAE - For old amiga games
• ScummVM - for my old Adventure games (preferred over Dosbox)
• Wine/Proton - for the vast majority of my gaming on Linux now
• RetroArch - a good all-in-one tool; it uses Libretro as a backend which is basically a distribution method/API to give access to other emulators like Dosbox, ScummVM etc.

There are also dedicated open source engines for old games like OpenTTD for Transport Tycoon Deluxe, and OpenMW for Morrowwind