Ribbit mobile: A Google voice alternative

Looking for  Google Voice alternative?  Today we will discuss about Ribbit Mobile service provided by Ribbit Corporation. Ribbit mobile service is very similar to Google voice and presently in Beta phase. You can  request an invite from the website to use this service for free.
Main features:
Intelligent Call Routing
Web Based Calling
Advance Called ID 2.0
Voice mail Transcriptions
Online message