Visual Boy Advance GX is a Game Boy Advance / Game Boy emulator based on VBA-M.

Features:

Wiimote, Nunchuk, Classic, and Gamecube controller support
SRAM and State saving
IPS/UPS/PPF patch support
Custom controller configurations
SD, USB, DVD, SMB, Zip, and 7z support
Compatiblity based on VBA-M r927
MEM2 ROM Storage for fast access
Auto frame skip for those core heavy games
Turbo speed, video zooming, widescreen, and unfiltered video options

Changes:

2.2.1 – August 14, 2010
* IOS 202 support removed
* USB 2.0 support via IOS 58 added – requires that IOS58 be pre-installed
* DVD support via AHBPROT – requires latest HBC

Plenty of legal GBA homebrew games to try out can be found here at PDRoms -> http://www.pdroms.de/files/gameboyadvance/

http://code.google.com/p/vba-wii/

SNES9x GX is a Super Nintendo emulator based on the PC emulator SNES9x 1.51. SoftDev is responsible for the original SNES9x 1.51 GameCube port, whose work was continued by crunchy2. Wii support was added by michniewski, and SNES9x 1.51 was ported by Tantric. The project is currently being maintained by michniewski and Tantric. The GUI is powered by libwiigui.

Features:

Based on Snes9x 1.52
Wiimote, Nunchuk, Classic, and Gamecube controller support
SNES Superscope, Mouse, Justifier support
Cheat support
Auto Load/Save Game Snapshots and SRAM
Custom controller configurations
SD, USB, DVD, SMB, Zip, and 7z support
Autodetect PAL/NTSC
16:9 widescreen support
Open Source!

Changes:

4.2.4 – August 14, 2010
* IOS 202 support removed
* USB 2.0 support via IOS 58 added – requires that IOS58 be pre-installed
* DVD support via AHBPROT – requires latest HBC

Free and legal SNES roms to try out with this emulator can be found here: http://www.pdroms.de/files/supernes/

http://code.google.com/p/snes9x-gx/

SNES9x GX is a Super Nintendo emulator based on the PC emulator SNES9x 1.51. SoftDev is responsible for the original SNES9x 1.51 GameCube port, whose work was continued by crunchy2. Wii support was added by michniewski, and SNES9x 1.51 was ported by Tantric. The project is currently being maintained by michniewski and Tantric. The GUI is powered by libwiigui.

Features:

Based on Snes9x 1.52
Wiimote, Nunchuk, Classic, and Gamecube controller support
SNES Superscope, Mouse, Justifier support
Cheat support
Auto Load/Save Game Snapshots and SRAM
Custom controller configurations
SD, USB, DVD, SMB, Zip, and 7z support
Autodetect PAL/NTSC
16:9 widescreen support
Open Source!

Changes:

4.2.4 – August 14, 2010
* IOS 202 support removed
* USB 2.0 support via IOS 58 added – requires that IOS58 be pre-installed
* DVD support via AHBPROT – requires latest HBC

Free and legal SNES roms to try out with this emulator can be found here: http://www.pdroms.de/files/supernes/

http://code.google.com/p/snes9x-gx/

The Powder Toy Wii is a port of The Powder Toy using SDL Wii. The Powder Toy is a desktop version of the classic ‘falling sand’ physics sandbox, it simulates air pressure and velocity as well as heat.

http://wiibrew.org/wiki/The_Powder_Toy_Wii

IOS58 Installer does one thing, and one thing only – download and install IOS58 from the Nintendo update servers. This process does not involve any system-critical parts of the system, and is completely safe. IOS58 is required for USB 2.0 support in homebrew applications and is the default IOS used by HBC 1.0.8+. It is included in System Menu 4.3, but those who do not wish to update to 4.3 can just run this installer to get the benefits of IOS58.

http://wiibrew.org/wiki/IOS58_Installer

This is a port of Super Mario War to the Wii, using SDL Wii. It should be fully functional with the exception of netplay.

Changes:

Fresh compile with latest libogc improvements
USB 2.0 via IOS58 support. Requires that IOS58 be pre-installed.

http://wiibrew.org/wiki/Super_Mario_War_Wii

DOSBox Wii is a port of DOSBox to the Wii using SDL Wii. It also features a Home menu powered by libwiigui.

Changes:

Updated to latest DOSBox SVN
USB 2.0 via IOS58 support. Requires that IOS58 be pre-installed.
Improved USB keyboard/mouse support

http://wiibrew.org/wiki/DOSBox_Wii

BlueMSX-Wii is an MSX 1/MSX 2/MSX 2+/Turbo R emulator for the Nintendo Wii.

This emulator is based on blueMSX, ported to run on the Nintendo Wii. The emulator will be feature complete, which means that everything works (audio, controllers, keyboard). A nice GUI is featured to choose the games/applications you wish to play.

Changes:

Updated devkitPPC (R21) and libogc (1.8.3)
Fixed vertical offset bug on NTSC wiis.
Fixed glitches in sound playback.
Improved audio, pause instead of hick on changing disks.
Reduced average audio lag from 85ms to 21ms, about the same as video lag now.
Greatly improved audio frequency stability.
Fixed issue with button mapping introduced in V1.0.1.
Gui coordinate fixes, not correctly centered since V1.0.1.
Small update in build-in gamepack.

http://wiibrew.org/wiki/BlueMSX-wii

Tetrominos Rebel is a game of avoiding attacking Tetris pieces using the Wii Remote’s IR pointer. The speed of the falling Tetrominos will increase as you progress through the game. Take a screenshot of your high score and brag to your friends using the built-in screenshot function!

http://wiibrew.org/wiki/Tetrominos_Rebel

This is yet another Tetris, but you can put your own sounds and graphics by editing the res/tetris.xml file. The Default skins are Keithris featuring Talking Classics’ Keith Apicary (Screw Attack), and a classic skin named Russia.

http://wiibrew.org/wiki/Tetris_Custom