this is a list of products that let you stack sats (mostly on LN), though it’s only a subset of all companies building on lightning…

https://www.stacksats.how/

Not sure it exist a centralized place of ALL things LN, but here you can find most of them: https://makers.bolt.fun/projects https://darthcoin.substack.com/p/lightning-network-is-awesome https://lightning.page

https://www.lightning-landscape.net/projects