[eimrine]

> I have a couple laptops dating back to 2013.

I have Lenovo x220 and this is my favorite laptop which does not afraid careless carrying in the middle of my backpack.

> Mobile phones

> Specifically anything that can run custom software.

My old phones (none of them is smartphone) cannot run custom software except of java midp 2.0

> Ask HN: Which old, functional, electronics do you have?

First what is coming to my mind is a beautiful 3-way stereo twice as old as me with paper diffusors. I never consider replacing them with anything else because despite they were built before hi-fi standard started existing, this sound is beautiful if you do not need basses.