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You need the Notes core DLLs to read an NSF, and those can only legally be distributed with the Notes client, Domino server, or with a product that ships under an OEM license granted by IBM. Nobody has reverse engineered the NSF data structures to the level that would be required to write a display program without the Notes core DLLs, and last I looked, IBM's license agreements would consider it a violation if you were to do so. It's been over 20 years, so I would not hold my breath waiting for it to happen.
Furthermore, any NSF can be encrypted, and any note within any NSF can be encrypted, which means that there are cases where data can not possibly be read without the key that is contained in the user ID file, so even if someone did write a viewer it would not always work.
If you want a viewer that doesn't require a Notes client, you can install a Domino server, enable web access, and give the appropriate URLs to your users -- but you said local NSFs, so I presume you don't want that.