Here are a few interesting projects/websites that use lightning in one way or another:
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LNURLVend. A $250 completely offline bitcoin vending machine using lightning. It's even battery powered, so you can just grab it and use it anywhere. Here's a video of it in action.
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Pollofeed. This is a live camera showing chickens. You can feed them by paying a few sats with lightning and see them eat their food live!
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Sphinx. Decentralized chat/social media/etc, you can even sell your texts/photos/media out of the box. All using sats.
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Juggernaut. Similar to sphinx. All using sats.
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Alby. Use lightning in the browser. You can authenticate (no more user/pass), and make lightning transactions right from your browser. No need to switch between apps or creating invoices. All works seamlessly.
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LNPay. Create lapps (lightning apps) easily by setting up paywalls or faucets with this service.
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Lightning Exchanges. List of exchanges that support withdrawals and sending bitcoin with lightning.
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SolDirac. A Q/A website that pays you sats via lightning to answer the questions.
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21 Days of Bitcoin course from the Bitcoin Magazine. Earn 2,100 sats for free redeemable through lightning while learning more about Bitcoin with this course.
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BTC Pay Server. Accept bitcoin with lightning at your store for free.
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bitrefill. Buy gift cards for many stores worldwide with lightning.
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Lightning network explorer. Cool map showing public lightning nodes all around the world.
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Satsback. Earn sats back whenever you buy stuff. It's like cashback but with sats instead, and paid with lightning.
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Lightning Network Stores. Directory of stores that support lightning.
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If you want to run a lightning node with 100% open source where you have full control of every aspect of the stack: Open source stack to run your own Lightning node⚡
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lightning address. Make your own lightning address for simpler payments in lightning.
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zebedee API. API to use sats as micro-payments in games.
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Mastering the Lightning Network. Github repository of the lightning book from Andreas Antonopoulos, where you can download the source code, and read the contents of the book for free.
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If you ever need to send a fax, you can do it with lightning
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If you need to send an SMS instead, here's how to send it with lightning
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Some great lightning wallets: If you just want the simplest non-custodial one, go with Muun. If you want the simplest custodial one, go with Wallet of Satoshi. If you want to be able to customize things a bit and maybe even use your own lightning node you can check out Breeze, BlueWallet, Phoenix. If you want a wallet with all the latest state of the art stuff implemented into it, check out Blixt. If you want to have full control of your lightning node, checkout Zeus.
Happy ⚡!