Today I set up my old laptop as a Debian server, hosting Immich (for photos), Nextcloud (for files), and Radicale (for calendar). It was surprisingly easy to do so after looking at the documentation and watching a couple videos online! Tomorrow I might try hosting something like Linkwarden or Karakeep.
What else should I self-host, aside from HA (I don’t have a smart home), Calibre (physical books are my jam), and Jellyfin (I don’t watch too many movies + don’t have a significant DVD/Blu-ray collection)?
I would like to keep my laptop confined to my local network since I don’t trust it to be secure enough against the internet.
edit: I forgot, I’m also hosting Tailscale so I can access my local network remotely!
I run a small setup on a seperate server segment (2nd router behind my main router) so it is on the internet.
I run nextcloud, an dendrite and conduit instance (matrix chat-server servers), a mastodon and go-to-social instance (fediverse), bitwarden (password manager), and others.
If there is a service that you do not want to be publically accessable by everybody but you do want to access from everywhere on the internet yourself, check out client-side TLS (https) certificates. The server does is accessable from the internet put only people who have a TLS certificate on their client signed by you can access it.
For services that do not require incoming connections from other machines (e.g. nextcloud, bitwarden, ... but no federated services like matrix-chat or the fediverse) that is a very good option to protect your servers.
Edit: I left out some stuff that you or others already mentioned. But here’s the extended list so I can copy/paste this if someone else asks in the future.
You may or may not be a developer, but I would like to vote for Gitea/Forgejo. Should you ever get a grasp of git, a git forge is great for keeping code and even plain text documents recorded. It’s my favorite self-hosted service by far.
It can even operate as an OIDC server, so you can create a single login for all your services (that support OIDC).
I’ll also recommend Grist, an alternative to Google Sheets (and Notion, I believe?). It’s a web interface to spreadsheets that supports Python code as formulas. (I’ve also tried Nocodb, another Notion alternative, and I much prefer Grist.)
Host a pangolin reverse proxy on a free oracle cloud VPS! It's super nice to redirect online traffic to a LAN resource, that way you can share your home lab with friends and family without having to forward any ports or loosen your security posture.
Actual Budget is an open-source envelope-style budgeting tool similar to YNAB. It has a self-hostable syncing service so that you can manage your budget across multiple devices.
The reason you might want to do this is that it's probably easier to do full account review sitting at your computer, but you might want to track expenses/receipts on your smartphone while you're away from home.
Snikket is easy to host in a docker container. You would have your own internet messenger for friends and family. Snikket is based on the xmpp protocol thats been around for 20 years, is tried and tested and very lightweight and does take very few resources on your server. things like Nintendo's messenger and WhatsApp are xmpp based).
What else should I self-host, aside from HA (I don’t have a smart home), Calibre (physical books are my jam), and Jellyfin (I don’t watch too many movies + don’t have a significant DVD/Blu-ray collection)?
You sound kind of like me, but physical books are not my jam. I host a lot of things I use all the time. The most used app I selfhost is SearxNG. When you get it all set up, in your browser settings you can substitute DDG for your private SearxNG instance.
I host Obsidian which is a note taking app. It houses all my compose files, step by step tuts I've written to myself, interesting code snippets, etc. There are several encryption plugins for Obsidian that allow you to encrypt the document itself to keep it away from nosy people.
I host Readeck and Karakeep. These are bookmark type apps. I use Readeck for 'read it later' type articles I find are interesting. Karakeep I use for data preservation. Both can be used for both bookmarks and data preservation, I just keep 'em separated.
I host a lot more but that might get the juices flowing as it were.
Home Assistant?
Maybe a homepage like Heimdall or some other dashboard? Maybe Uptime Kuma to notify you when your services go down?
Definately a pihole or adguard home. Biggest quality of life improvement. It's the biggest thing my wife notices and approves of. She audibly groans in disgust when she leaves the LAN on her cellphone and sees all the ads and garbage that had previously been blocked. My pihole dashboard show 70% of the requests are blocked on my LAN. And everything works great.
Straying away from utilities, games are always fun to host. I got started with self hosting by hosting a minecraft server, but there are plenty of options.
I host a number of alternate frontends. Alexandrite for Lemmy, Redlib for Reddit, Invidious for Youtube. And then I have the Privacy Redirect extension make any links to Reddit or Youtube go to my local.
If you're just looking for something to chew up CPU cycles and don't know what to host, consider something like BOINC where you're "self-hosting" (extremely loose term) scientific research, like cancer, new drugs, etc.
Karakeep is fantastic, I know you mentioned it already, but I just wanted to shout it out. The AI tagging is a little gimmicky and pointless, but it's super nice to have a really searchable, automatically organized bookmark manager.