Namechk

Namechk scans more than 140 sites to find people open usernames.

(Credit: Screenshot by Josh Lowensohn / CNET)

Namechk launched this time last year and lets you scout out open usernames across a handful of sites. This is useful for companies that want to establish a new brand on places like Facebook and Twitter without having to do all the legwork. For basic users it can also be a simple way to discover new sites where you might be able to get away with using the same log-in.

When we first covered it, it handled 84 different sites. It's since gone on to support 145.