Instant Username Search - Check out if your username is available
Gravatar - Gravatar (an abbreviation for globally recognized avatar) is a service for providing...
Namechk - See if your username is available on 100+ social networks
42matters Explorer - Explorer by 42matters is a research tool to visually explore databases of apps, publishers, audiences, SDKs, technologies, contacts and others.
OYZTA - The finest from the sea of brandable domains
GeoPeeker - GeoPeeker is a tool for viewing sites from different geographic solutions.