I've heard of BRK: nostr:nprofile1qqsfw5dacngjlahye34krvgz7u0yghhjgk7gxzl5ptm9v6n2y3sn03sppemhxue69uhkummn9ekx7mp0qythwumn8ghj7un9d3shjtnwdaehgu3wvfskuep0qythwumn8ghj7un9d3shjtnswf5k6ctv9ehx2ap0rxn0uh
Here's an easy first project for a new bitcoin dev: make a "server explorer" for the various types of servers in bitcoin
Electrum servers, lightning nodes, and bitcoin nodes are all common servers that wallets and exchanges interact with. Lightning explorers are already very common (e.g. https://mempool.space/lightning), and this electrum server explorer already exists: https://1209k.com/bitcoin-eye/ele.php?chain=btc
But it isn't very pretty, and I'm not aware of anything similar for exploring bitcoin nodes and their features. Someone should make one that is beautiful and fun!
Discussion
To clarify, BRK is a server/service itself and an alternative to electrs/mempool.space (and also glassnode but out of context here) not an aggregator like super testnet is proposing