Sharpii is a command line app for windows that I (person66) made, which uses leathl's libWiiSharp.dll (as of version 1.2 it acutally uses scooby74029's mod of libWiiSharp) to perform tasks such as:

• Pack, unpack, or edit .wad files
• Pack, and unpack U8 archives
• Patch IOS .wad files with various patches
• Download files from NUS
• Convert a .wav file to .bns, and vice versa
• Convert an image file to a .tpl, and vice versa
• Send a .dol or .wad to the Homebrew Channel over Wi-Fi

For more details see the readme.txt in the sharpii folder or visit the official Sharpii thread at: http://gbatemp.net/topic/309756-sharpii/

You can download the latest version of Sharpii on the project's releases page: https://github.com/mogzol/sharpii/releases/