Relics Different

(Cross-posted elsewhere. Sorry, Heather.)

OK, I need help and or advice. I have, over the years, collected a handful of old computers that, really, you know, I just don’t need. An old Mac Plus. An early PowerMac Performa. A stripped-down Lombard G3. Etc. I really hate the idea of just putting them in my trash can, but I really don’t know what to do with them. Anybody want them, or know what I can do with them?