Yet Another 3DSFE Save (De)compressor
In the vein of FEAST, or FEST.
The twist here is that there is executable for you to download; this save compressor/decompressor runs entirely in your browser (and I do mean in your browser, not on my server—it's all client-side; you can save this file and run it locally even without an internet connection), no .NET runtime needed.
Compression has been implemented. Compression is not actually necessary; decompressed files can be loaded as-is if you rename them, and are generally small enough that compression barely matters.
In addition to the above buttons, you can also probably drag-and-drop a folder to get a best-effort attempt at decompressing all the files inside, given that you have a reasonably modern browser (but also I didn't test this on anything other than Firefox).
Error reports appear below this line.