I just installed Miniflux on my server as well.

Advantages (in my opinion) are: Package is in Debian repos (safe and no compilation needed), software is a static binary (thus does not require docker and only needs postgreSQL), documentation is good.

And Snikket for super-easy setup and management

Synapse has seemingly improved since 2020. A word of warning though: if you join large rooms from your server, Synapse will eventually grow the DB to a huge size due to a “lookup” table state_groups_state, and will require manual cleanup. See https://www.sequentialread.com/matrix-synapse-out-of-disk-space-state_groups_state/

Xed editor comes close in terms of handling files-as-files, but I found it more cumbersome and buggy than Markor.