[dobin]

I am also creating a Log viewer in a single HTML file (like Splunk, but a bit smaller). Pure JavaScript with no dependencies makes it runnable and integratable everywhere, which is nice.

https://github.com/dobin/SemiDataSieve

[SahAssar]

Something you might be interested in is that journalctl (systemd's logger) can output real time logs in a format for server-sent-events (journalctl -o json-sse) so with a minimal bash http wrapper you can get realtime logs from most linux systems into your app.