I'm on a quest to self-host all the services I consume. Mastodon, email, etc.
I have most of what I need for that now.
What I still need, and hope someone has collecting dust, is a small cabinet rack (19", maybe 10u?) for my network and server gear, and a rackmount full-sized ATX case. Other stuff that would be useful, but less critical, are spinning rust drives in the 1TB+ range, NVME drives in the 250GB+ range, and LTO drives and tapes.
Do I actually expect people to just give me that stuff? No, of course not. But I've been repeatedly surprised by what people will give away, so I feel fine about asking.
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