Note that these websites may not be that useful, but they're definitely a fun way to experiemnt with LN.
Pollofeed.com:
Probably the coolest of them all.
You can feed the chicken by sending 1000 satoshi's... and you can see it happening live from a surveillance camera.
lnsms.world:
I already made a thread about this one a while ago. The website allows you to send texts to 223 countries.
I wouldn't suggest using it if you are from a third world country (especially the MENA region) as it can be a bit expensive.
Sat2.io:
I also made a thread for this service on the Arabic's local board.
The website allows you to send bitcoins to a phone number. Pretty simple to use:
If you're the sender:
1. You fill the fields (phone number and amount) and click send.
2. An invoice will be given to you, send funds to it.
3. Done (Make sure to save the link).
If you're the recipient:
1. Open the received link and confirm.
2. Confirm again and open your wallet.
3. That's it! You should have the funds in your wallet.
Paywall.link:
You can lock any link and make people pay using LN in order to unlock it.
Kriptode/Satoshi's world:
You can add any text/image anywhere where streetview is available.
Here is an example where I added Bitcointalk's logo somewhere in Greenland.