The eEye Retina Community is a free vulnerability scanner that identifies vulnerabilities. The software comes from eEye Digital Security. It is a vulnerability management software that is suitable for any business or industry in need of endpoint protection and a secure configuration compliance.
“Retina is an ideal network security platform for reporting on threats that may compromise IT systems," said Kevin Hickey, eEye CEO." 
Overall score: Thumbs up. The eEye Retina is a prominent product that will provide "zero-day vulnerability identification."
"With Retina Community, enterprises and SMBs can strengthen security and compliance posture"
Note: In addition to the eEye Retina Community, the company has other Retina products (which are not free): Retina Consulting, Retina Network, and Retina CS Management, so it may best to compare them to see which one is most suitable for your environment.
Advice: Check out the latest information on eEye Retina from eEye Digital Security's own Community Forum at http://forums.eeye.com.