Alpha of the SDSetup Switch Homebrew App. This app allows you to access and download packages from www.sdsetup.com right on your Switch, no PC required! Many homebrews, CFWs and sysmodules can be updated without ever taking out your SD card.
The app can be controlled with touch input or with controllers via a cursor.
RetroArch is not available through this app as ZIPs with all packages including RetroArch are greater than 500MB, larger than the maximum memory allocated to album. I'll see what I can do in the future to workaround this. Note you can download RetroArch cores through RetroArch itself anyways.
Source on Github