These are some of my favorite useful or fun to use services that can be used with Lightning:

Anonymous, Pay-As-You-Go Generative AI software.
https://micropay.ai

Create Paywalls for Links and Pay with Lightning
https://coinpatron.io

Exchange L-BTC/BTC Anonymous
https://boltz.exchange/

Get Lightning Ibound Liquidity
https://deezy.io

Find Best Lightning Nodes To Connect To
https://moneni.com/nodematch

Send Fax Anonymous And Pay With Lightning - How About Sending Some Banks The White Paper? :D
https://bitcoinfax.net/

Receive/Send SMS And Pay With Sats
https://sms4sats.com

A Gadget Store For Bitcoiners ;-)
https://shop.lnbits.com

Buy Vouchers For Almost Anything Your Heart Desires With Sats
https://www.bitrefill.com

Great List Of Lightning Projects
https://makers.bolt.fun/feed

Another List With Lightning Projects + Stores
https://lightningnetworkstores.com/

Create Virtual Non-KYC Debit Cards Within Seconds
https://coindebit.io

Great Lightning Centric Onboarding Guide For Newcomers, To Start Their Bitcoin Journey
https://linktr.ee/bitcoinguide

Create Lightning Burner Wallets + Play Around with Extensions (LNURLw, LNURLp etc.)
https://legend.lnbits.com/

I would love to hear your recommendations! Looking forward for to see what you can recommend :-)