I think everybody on here is constantly keeping an eye out for what to host next. Sometimes you spinup something which chugs along nicely but sometimes you find out you’ve been missing out.
For me it’s not very refreshing or new: Paperless-ngx. Never thought I would add all my administration to it. But it’s great. I probably can’t find the thing I need, but I should have a record of every mail or letter I’ve gotten. Close second is Wanderer. But I would like to have a little bit more features like adding recorded routes to view speed and compare with previous walks. But that’s not what it is intended for.
What is that service for you?
WhatsApp disconnects you if you don’t open the official app every 14 days or so. So you definitely need it. I run it on an old tablet. It’s supposed to run in a virtual machine (running Android) as well.
I’ve used an old phone just for this task… ;-)