Checks which public IPFS gateways are online or not.
NOTE: All of these (except gateway.ipfs.io and ipfs.io) are hosted by third-parties and should be treated as such.
You can view this website on GitHub Pages: https://ipfs.github.io/public-gateway-checker/
Here's a screenshot:
A CLI version ipfg is available here: https://github.com/JayBrown/Tools/tree/master/ipfg
If you'd like to add a new public gateway, please edit gateways.json and submit a pull request.