I use next cloud calendars I can sync it with my phone using davx

And on mobile I use Feeder I just exported my follows from my pc and imported that to mobile

Also, you can follow lemmy feeds YouTube channels, podcast and more

i use Yarr

For a non federated option I love guilded

I head that they are working on fixing the search functionally but in the mean time there is this git hub https://github.com/marsara9/lemmy-search that your server admin can add to their lemmy instance