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This article is for emulators on systems without their own Emulators on consoles page. Mostly due to so few emulators being created on them.

Sections

Devices: Devices that do not fit in the category of Console, Operating system or computer

RetroFW, Arduino, Caanoo, PocketSprite, Zodiac

Operating systems And Firmware: Operating systems that are not discontinued but have such a small market share that having an article for them would be excessive for how little emulators are for a single operating system listed.

QNX, KaiOS MorpOS, Haiku, Maemo, ZealOS, MediOS, Miyoo, Solaris, Zaurus, ToaruOS, Rockbox

Other Systems: Systems with only 1/2 Interpretor(s) or emulator(s)

Computers/Operating systems (Systems listed Atari 8-bit, PC-8801, Redox OS).
Console (Systems listed Fairchild Channel F, ColecoVision/Coleco ADAM, PC Engine/TurboGrafx-16, NES).
Handheld (Systems listed Pokémon Mini, Atari Lynx, Dingoo, Leapster GS, LeapPad 2, TM4C123)
Game Engine (Engine listed Megazeux)
Other (Products listed Zaurus, Python, Uzebox, MEGA65, Virtual Boy, Blackberry)
Fantasy Computers (Systems Listed PICO-8, TIC-80)

Devices

RetroFW

FCEUX for RetroFW 2.0 - port of FCEUX, NES emulator.
MIDPath for RetroFW 1.0 - Java ME emulator.

Arduino

ArduinoGotchi - Tamagotchi emulator.
nofrendo-arcada - Port of Nofrendo, NES emulator.
8boy - CHIP-8 interpreter for Arduboy.

Caanoo

NESGP2x for Caanoo 1.0 - NES emulator.
GPFCE for Caanoo 0.4+. - NES emulator based on FCE.
Caanoo2600 1.1.0 - Atari 2600 emulator.

PocketSprite

gnuboy for PocketSprite - Gameboy emulator
8bkc-nofrendo for PocketSprite - Port of Nofrendo, NES emulator.

Zodiac

install PopAccess to play unsigned Zodiac software..

LittleJohn for Zodiac 1.2 - port of LittleJohn, NES.GameBoy, SNES, Sega Genesis emulators, TG16, NeoGeo Pocket and WonderSwan emulator.
Zquake - Quake Source port.
FrodoZ - Commodore 64 emulator.
ZHexen - Hexen Source port.
ZHexen II - Hexen II Source port.

Operating systems\Firmware

QNX

PhMAME - Port of phMAME for QNX.
VICE - Port of VICE for QNX.

KaiOS

MobiArch - RetroArch like program made for KaiOS.
DALE-8 - CHIP-8 interpreter, also a MobiArch core.
MobiPICO - PICO-8 emulator, also a MobiArch core.

MorphOS

ScummVM 2.8.1 - ScummVM.
Fuse 0.10.0.1 - FUSE for MorphOS.
AmiArcadia 33.5 - Arcadia 2001 emulator.
EasyRPG Player 0.6.2.3 - EasyRPG for MorphOS.
ACE 1.24 - Amstrad CPC emulator.
SpaceCadetPinball - SpaceCadetPinball Port.

Haiku

Maemo‏‎

ScummVM 2.1.1

below taken from maemo wiki's emulator list, have not been tested.

N900 Yabuse
MAME - MAME Port.
pcsx-m - Maemo Edition.
psx4all - Maemo Edition.

ZealOS

cherub - Game Boy emulator by Alec Murphy for TempleOS, ported to ZealOS.
CHIP-8 - CHIP-8 interpreter for ZealOS (developed by TomAwezome).
Bakers Doom Port of Alec Murphy's chocolate-doom loader for TempleOS to ZealOS.

MediOS

aoBoy Game Boy emulator for the Gmini400,AV3XX.
aoSMS SMS emulator for the Gmini400/402(cc).
aoNES - NES emulator for the the Gmini400/402(cc).
aoDoom - Doom Source port for the Gmini400, Gmini402(cc), AV400, AV300.

Miyoo

see MiyooCFW's GitHub page for a list of all emulators

RetroArch - RetroArch.
snes9x4d - Snes9x port.
gnash-miyoo - Flash Player.
dragon - port of Xroar.
gpchip - CHIP-8 interpreter.
beebem-rg350 - Port of Beebem.

Solaris

VirtualBox.
VICE - Commodore 64 emulator.
saturn - 40G, 48GX, 49G Calculator emulator.
iNES - NES emulator.

Zaurus

QCopilot - Palm OS emulator.
Frodo - Commodore 64 emulator.
sz81 - Sinclair ZX81 emulator.

ToaruOS

doom - Doom Source port.
bochs - Port of Bochs.
quake - Quake Source port.

Rockbox

see Rockbox's Plugin index for info on hardware support for the below software

ZXBox - ZX Spectrum emulator, Spectemu port.
Chip8 - CHIP-8 interpreter.
Rockboy - Game Boy emulator, GNUboy port.
Rockdoom - Source port of Doom.
Duke3D - Source port of Duke Nukem 3D.
Wolf3D - Source port of Wolfenstein 3D.
Quake - Source port of Quake.

Other Systems

Computer\Operating system

Commander X16 Emulator.
PrBoom (Source port) - FreeDOOM 1 and 2, DOOM (Shareware) Redox port. Built into the demo
DOSBox - Redox port. Built into the demo

Console

CHIP-F8 - CHIP-8 interpreter for the Fairchild Channel F
Vision-8 - CHIP-8 interpreter for ColecoVision, and Coleco Adam.
chipce8 - CHIP-8 interpreter for the PC Engine/TurboGrafx-16.
Nes-Chip8 - CHIP-8 interpreter for NES.

Handheld

chip-8-mini - CHIP-8 interpreter for Pokémon Mini.
Chip8 CHIP-8 interpreter for the Atari Lynx.
Nofrendo r1 - NES Emulator for the Dingoo.
retroleap - retroarch-based firmware for Leapster GS and LeapPad2. *sshflash/sshflash win (needed to flash leapfrog device firmware over SSH).

Game Engine

Chip8 for Megazeux - CHIP-8 interpreter for Megazeux.

Fantasy Computers

CHIP-8 Emulator - CHIP-8 interpreter for PICO-8.
CHIP-80 - CHIP-8 interpret for TIC-80.

Other

gnuboy - GnuBoy, Gameboy (color) emulator for Zaurus.
Chip-gr8 for python - CHIP-8 interpreter in python (to vs AI).
uze8 for Uzebox - Chip8/SuperChip interpreter for Uzebox.
gbc4mega65 - Game Boy and Game Boy Color Core for MEGA65.
GBEmu (Only GB) for Virtual Boy 0.1.
FCEUXpb for Blackberry 1.0.0.18.

Emulators on other systems