NxNandManager is a command line (and GUI) utility for Windows 7 & 10, the primary purpose of which is to copy Nintendo Switch content (full NAND or specific partition) from/to a file or physical drive.
A direct port of mGBA for the nintendo Switch. mGBA is an emulator for running Game Boy Advance games. It aims to be faster and more accurate than many existing Game Boy Advance emulators, as well as adding features that other emulators lack.
Linkalho is an homebrew app that will link NNID accounts offline. It links (or unlinks) existing accounts so you won't lose your saves. This app does not create a new account. If you create a new account and want to link it, just re-run the app.