It will open again?
Although this site was useful to verify a signed message!
I hope the owner of brainwallet ,will reopen the site again.
It's still dead, i'm not get any information about they will rise from the grave.
you can use their open source code if you want:
https://github.com/brainwalletIf you need to just sign message or verify only you can use dekstop wallet, Electrum for example.
Their source code isn't located there anymore. When they took down the site, they deleted everything from their Github page as well. If you want to use it, you'll need to find a user who saved a copy of all the source code files before they were removed and request that they send you the files.