Several. I can't say I've found a "definitive" one though. I'll just tell you what to do here
You're going to want to download "
homebrew_launcher_rpx.v2.1.zip" from here:
https://github.com/dimok789/homebrew_launcher/releases
You'll also want Saviine, which you can find here:
http://wiiubrew.org/wiki/Saviine
Extract both zip folders, and then place the contents onto the root of your SD card.
Put the SD card into your Wii U, and then open up the internet browser.
There are multiple websites that will let you do this, but I use "loadiine.ovh" It should automatically detect your firmware, and then press enter.
Your Wii U will more than likely freeze as the screen is fading white. Just reset the console and go back to the website and keep trying.
Eventually it will work. I can continue to help you if you've gotten this far.