This is a standard problem with no easy answers.
Dealing with an estate is
a major time-sink, and most beneficiaries will balance the money they get with how much of their remaining life they are prepared to spend on things that don't interest them.
I doubt a college etc would take anything old: won't fit their curriculum, won't want to deal with unknown functionality/safety issues.
A hackspace/makerspace might take it, iff they have room. Their (young) members won't be interested in anything "old". If/when they bother to play around with it, they
will damage it. Damage can include forcing wrong connectors together, floating a scope etc etc.
Your beneficiaries won't want it, and will simply want a clear empty house that can be sold. They will use "house clearance specialists", who will either dump it or take it to a local auction house.
The local auction house knows how to classify some things so they can be found when browsing. Such classifications include china/silver/taxidermy/tools/cameras/"scientific instruments"/radios. It won't fit into any of those, so it won't be classified, and will be difficult to find by browsing. They won't know what a "spectrum analyser" is, and will probably mis-spell "oscilloscope" and brand names, thus reducing the ability to search for them. Since it is unlikely that two people will notice and bid for an item, they will sell for the starting price, at best. Test all that by visiting
https://www.the-saleroom.com/en-gb/search-results?searchterm=oscilloscope and then trying to find the similar items in that auction
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A better bet is an auction house that specialises in surplus equipment, e.g.
https://www.ramco.co.uk/ or
https://www.ppauctions.com/ or a local equivalent. They will at least classify things sensibly, but purchasers won't be able to see them switched on and working. Your beneficiaries will still have to go to the trouble of getting all your "rubbish" there - iff they can be bothered.
Hamfests in the UK are now little more than flea markets, with only a few people that only want to spend a pittance. It is unlikely they would have more than £100 cash on them, so even if they want something decent, they won't buy it there. I've recently picked up microwave sources for £5 and 200ps risetime (1.7GHz) sampling scopes for £25.
I've been through all that recently with my parent's treasures, mainly antiques and taxidermy. We looked at several neaby auction houses, and settled on the one that would come to the house and catalogue items decently, and then take them all to the auction house. It took several people several days to do the catalogue, and the removers over a day to load and move the stuff. Even though that auction house did a decent job of cataloguing the items, they do struggle with test equipment - to my benefit
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For my stuff the only thing I've been able to do is point out to my daughter that the items are worth far more than she guesses. They aren't just bits of wire and boxes. I keep a document listing the points above, the principal items and the likely selling value, in the hope she will pass that on to an auction house.
Other people I've seen have decided to gradually thin their herd so their beneficiaries haven't got the hassle.
i also have a terrible pain in all the diodes down my left side
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