What differs from each implementation? Why are there multiple? I'm still new to LN.

Lightning implementations

- LND by Lightning Labs

- CLN by Blockstream

-  LDK by Spiral

UmbrelOS = Plug + play or DIY

More info: https://bitcoiner.guide/node/

Rsync25

It's a developer library designed to run at the application layer. It's specifically designed and optimized to run on mobile phones with the ability to lightly customise things e.g uses RGS (rapid gossip sync), esplora (getting blockchain data) etc

We've also enabled developers on multiple platforms to utilise this through language bindings in Kotlin (Android), Swift (iOS), Python and more.

Check out this example project to learn more - https://github.com/reez/Monday