Lightning-dev: Lightning Network discussion, proposals, and standards development
Bitcoin Optech: weekly summary of development progress in Bitcoin and Lightning
LND: devs, users, vendors, anyone building on Lightning Labs' Lightning Network Daemon (LND):
Lapps.co mailing list: your weekly dose of Lightning apps
Lightning Hood: weekly roundup of Lightning and Bitcoin news
Social media sites built on, by, or for the Lightning Network.
LND Lightning Developers Slack: troubleshooting and discussion for LND users
Lightning Makers: Telegram group for Lightning project sharing and discussions
Yalls: post and read in a forum powered by Lightning tips
Lightning Network Subreddit