Emulators

Emulators will allow you to play stuff from gaming console or other smaller stuff on your laptop, pc or phone. Think of it being like a Virtual Machine, in the shape of a SNES or a PS2. Nowadays most phones can run Playstation 1 and PSP type stuff with a little tweaking to the settings!
Below you'll find links to various emulators I use or used for both computer and (mostly) android phones.

All-in-1; RetroArch!
PC
Android
This emulator features the amazing option to emulate a ton of system! All you do is download the 'core' and which 'core' you load determines the system you're emulating. It's all build in with easy enough menu's to navigate.

Gameboy Advanced/Colour
PC
Gameboy Advanced for Android
Gameboy Colour for Android
For the PC, simply VisualboyAdvanced will run all GB adjacent games. For Android you will need to get either the GB/C and GBA versions separately depending on what you want to play.

NEO GEO
Android

Nintendo64; Project 64
PC
Android

Nintendo DS; Desmume
PC
Android
I use this DS emu when I'm not using MelonDS.

Gamecube/Wii; Dolphin
PC
Android
This one for the Gamecube also has the option to function as a Wii emu!

Nintendo; NEStopia
PC
Android

Super Nintendo; SNES9x
PC
Android

Dreamcast; Redream
PC
Android

Sega Saturn; SSF
PC
Android

Playstation; Duckstation (Get the Nightly build!)
PC
Android

Playstation 2; PSCSX2
PC
Android

Playstation Portable; PPSSPP
PC
Android


To run most emulators, you will need a BIOS File. Legally I cannot be seen throwing those out there, but these are not terribly hard to find.

ROM's

A ROM is simply the game file. Sometimes the company that published or produced the games will go on an internet hunt to kill as many ROM sites as possible. Always look around a bit yourself! You never know when a site gets nuked to quickly stop legal devastation. USB drives are your friends.

Coolrom

Zophar's Domain

Sony ISOs