Sherlock is not the first tools used to scan for available usernames...and it will not be the last. Here are some links to other tools that we are aware of.

NOTE: This list does not constitute an endorsement.

• WhatsMyName

  Sherlock follows a similar design, but appears to be parallel evolution.
  This project is earlier than Sherlock.

• Checker Command Line

• Penguin API

• Sherlock Implementation In Go

• investigo: Sherlock Implementation In Go

• socialscan

Here are some web sites that provide username checking:

• Namecheckr
• Checkusernames