Stock them in the attic for sentimental/nostalgic value (e.g. a book about the architecture of the MC6802 chip might be considered "unwanted" in the current era, but is *was* where I started assembler and having fun writing disassemblers)
Well... maybe "unloved" would make your wisdom fit my view more precisely... because sometimes, "unwanted" overcomes "loved" for lack of an endowment to expand my shelf space... and a lack of eager recipients for old CP/M or RT11 docs. : - )
If you didn't program your executable by toggling in binary, it wasn't really programming!