Hardware: old laptop from ~2012 and some external hard drives (~25W total).
Occasionally used for things like yahoo answers archiving, fishnet (distributed lichess game analysis), random big computations or downloads, and other things I want to run overnight but don't need a big desktop PC for.
Services it more permanently hosts:
- email for me and friends
- websites of friends
- game server (Factorio, OpenArena, custom games I made, etc.)
- SSH -D functioning as a VPN when paypal or some such is being a bitch again
- [web] blog
- [web] grocery list (custom. It syncs between devices, stores recipes, frequently bought items, etc.)
- [web] link shortener / pastebin / file sharing in one
- [web] a data explorer for some game (with associated scraper running every few hours)
- [web] a series tracker to note which episode file we're at because apple tv is garbage (for many reasons) and doesn't remember this
- [web] browser-based latency test thingy, both as plain HTTPS and websocket (they're remarkably similar with HTTPS connection reuse, the main difference being that websocket breaks when your connection is down for 0.1s or your IP changes, so I use websocket more as canary and the HTTPS version for actual latency testing)
- [web] proxies for certain sites, like to speed up the openstreetmap wiki by caching or to remove the 5MB unnecessary javascript from a news website
- data scraper that emails me when the local river does something that interests me (like get close to flooding or drying up or a sudden large change)
- other data scrapers
- Telegram bot
- IRC bouncer
- Gitea
- Restic backup server
And a ton of web things I'm forgetting, including little .php scripts not worth mentioning that I occasionally use to do this or that.
I'm really amazed what I can do with some hardware that would otherwise be thrown away or disappear into an old drawer never to be used again. I could probably host twice as many things and it would still work (CPU and network are basically idle the whole time, only RAM would be getting tight then... I could upgrade to 16 GB DDR3 which is cheap nowadays).