Comment by idonotknowwhy

The Nes classic console. The roms had an iNes emulator header lol.

And the playstation classic used an opensource ps1 emulator.

There was also some steam game ported from GameCube, and it had the Dolphin Emulator FPS counter in the corner of part of the trailer :D

I also remember reading that 2 of the PCSX2 devs ended up working on the EmotionEngine chip emulator for PS3 consoles with partial software emulation of PS2 (The CECH 02 and later models where they removed the EmotionEngine chip)