Over the holiday we saw a True Crime: Streets of LA PS2 FPKG for PS4, and following his PS4 Mednafen 2-Players Config Mod PlayStation 4 scene developer @Markus95 (aka @Kus00095) shared on Twitter a Nintendo 64 (N64) PS2 on PS4 Emulator Port demonstration video with details below proceeded by a Super Mario 64 (SM64) Native Port PS4 PKG. 
Based on the DaedalusX64 Nintendo 64 Emulator Github fork, belek666 also shared a daedalusps2.zip (34.2 MB) Daedalus PS2 binary stating: Put files/folders on root directory of mass, looks for roms in 'Roms' directory.
According to the Tweets from Markus00095 below, N64 PS2 on PS4 works but has issues since the only solution is to use mc0: (8 MB max) for games as mass: (USB) isn't enabled just cdfs: or mc0/mc1.
As a result of his tests he currently has no plans to release a N64 PS2 on PS4 PKG... however, those interested may want to experiment with the Daedalus.elf PS2 binary using the previously released PS2 ELF Loader for PS4 (PS2 Loaders) in the meantime.
Finally, for those still with a PlayStation 3 console scene developer emu_kidid made available a PS3 PoC (Proof-of-Concept) of a very old mupen64 (wii64) port to PS3 using PSL1GHT v1 with details and some demo videos via KevinT Creations below.
Download: ps364_gln64_basictest.7z (contains ps364_glN64.elf and ps364_glN64.self) / GIT
Found this on my HDD from way back in 2011 when we were messing with porting wii64 (mupen64) to the PS3. It has preliminary hardware rendered graphics (RSX) limited to a handful of games as well as pure interpreter only and bad audio.
I'm not sure what state the release I've attached is in because I compiled it a long time ago, it's messy and it was just considered a "test".
Edit: It seems better than I remember
Mariokart 64 on PS3 Alpha Test
N64 emulator for PS3 WORKING!!! Mupen64 wii64 cube64
Super Mario 64 on PS3 (Native)
Based on the DaedalusX64 Nintendo 64 Emulator Github fork, belek666 also shared a daedalusps2.zip (34.2 MB) Daedalus PS2 binary stating: Put files/folders on root directory of mass, looks for roms in 'Roms' directory.
According to the Tweets from Markus00095 below, N64 PS2 on PS4 works but has issues since the only solution is to use mc0: (8 MB max) for games as mass: (USB) isn't enabled just cdfs: or mc0/mc1.
As a result of his tests he currently has no plans to release a N64 PS2 on PS4 PKG... however, those interested may want to experiment with the Daedalus.elf PS2 binary using the previously released PS2 ELF Loader for PS4 (PS2 Loaders) in the meantime.
Finally, for those still with a PlayStation 3 console scene developer emu_kidid made available a PS3 PoC (Proof-of-Concept) of a very old mupen64 (wii64) port to PS3 using PSL1GHT v1 with details and some demo videos via KevinT Creations below.
Download: ps364_gln64_basictest.7z (contains ps364_glN64.elf and ps364_glN64.self) / GIT
Found this on my HDD from way back in 2011 when we were messing with porting wii64 (mupen64) to the PS3. It has preliminary hardware rendered graphics (RSX) limited to a handful of games as well as pure interpreter only and bad audio.
Edit: It seems better than I remember
Mariokart 64 on PS3 Alpha Test
N64 emulator for PS3 WORKING!!! Mupen64 wii64 cube64
Super Mario 64 on PS3 (Native)
For those still interested in PlayStation 2 developments, here is another of interest for PS2 scene homebrew devs via 
