Hello I was looking around on the internet and I was unable to find anything concrete. I would like to find a good Wiimote API (in C or C++) that also implements usage of the Wii Motion Plus accessory. If anyone knows of any good ones it would be greatly appreciated. Thanks.
I use WiiYourself. You might need to adapt one thing or another, such as the connection timeout, but it works quite well.
Take also a look at WiiBrew's Wiimote page and Wiimote driver page.