[russfink]

Or zstd. I have some dd blobs of partitions, the blobs are zstandard-compressed, would like to mount them.

[mxmlnkn]

Ratarmount also works for that. However, it, and any other tool I know of, works only well if it was compressed with pzstd because of a limitation of the zstd format. It needs separate zstd frames for fast seeking.