awesome-lnurl VS rgb-core

Coincorner fees aside, this works on an open standard: https://github.com/fiatjaf/awesome-lnurl

What you are looking for is LNURL. Electrum has LNURL not implemented it yet. You find a list of LNURL capable wallets and solutions here: https://github.com/fiatjaf/awesome-lnurl

Awesome things done with lightning's lnurl protocol

Yes use a wallet that supports lnurl-auth. Full list here: https://github.com/fiatjaf/awesome-lnurl

Yes, but sender is not required to use Strike. Also, it's Strike API, not Strike app, but API details are not public, likely you will be able to link your account with other wallets too. With LNURL it should be possible.

I really like all the new things that keep popping up, like Lightning Address, and the lnurl protocol

The lnurl protocol makes things extremely smooth and nice. Also you can use Lightning wallets for authentication, and so many cool things keep popping up all the time, like Lightning Address so that you can setup a payment through lightning to any "internet static identifier" like an email, telegram username, whatever.

This faucet uses one of the new protocols for lightning, lnurl, and it makes the transfer of Bitcoin with Lightning literally as easy as clicking a link.

Recently Maxim Orlovsky, the lead developer and architect of RGB wrote an RGB explanation letter to bitcoin dev mailing list, which led to a very productive discussion on the topics of what RGB is (spoiler - no, it's not a token protocol), how it works, what can be done with it. One of the core lines in the email was the v0.10 release that happened a week back and demonstrated how RGB works in the wild in the command line. Check GitHub and YouTube videos with RGB demo for more info. Maxim also dismissed many myths and misconceptions created over the past years by people outside of RGB dev team. Initial email : https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2023-April/021554.html Responses by Maxim Orlovsky: https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2023-April/021559.html https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2023-April/021564.html https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2023-April/021577.html

Documentation takes time. Also, we are now finishing the release v0.10 of our libraries (RGB Core library has already been released https://github.com/RGB-WG/rgb-core/releases/tag/v0.10.0-beta.2 which consists a lot of refactoring of the consensus-level code and introducing new things such as Interfaces, all of which made writing a classical documentation a bit useless in the past. With the version 0.10 all the materials will be updated and are being updated as we speak.

Check out the repo here https://github.com/RGB-WG/rgb-core/releases/tag/v0.10.0-beta.1

LNP is working on RGB protocol. A new protocol that will enable smart contract on a layer 2 and even on a layer 3 (on top of LN). LNP keep making progress and just released version 0.7 (beta): https://github.com/RGB-WG/rgb-core/releases/tag/v0.7.0-beta.1

You can check the development directly in gihutb and the website for general info.