Mednafen is a great multiplatform emulator that emulates the following platforms:

• Atari Lynx [lynx]
• GameBoy (Color) [gb]
• GameBoy Advance [gba]
• Neo Geo Pocket (Color) [ngp]
• Nintendo Entertainment System/Famicom [nes]
• PC Engine (CD)/TurboGrafx 16 (CD)/SuperGrafx [pce]
• PC-FX [pcfx]
• Sega Game Gear [gg]
• Sega Genesis/MegaDrive [md]
• Sega Master System [sms]
• Sony PlayStation [psx]
• Super Nintendo Entertainment System/Super Famicom [snes]
• Virtual Boy [vb]
• WonderSwan [wswan]

The quality of emulation is very good.
There is support for graphic filters.
Attention: emulator runs only from command line. But you can use shell: Mednaffe or MedGui Reborn.
To fully work with the emulator, you should read the documentation. Also, do not forget about the F1 key.