port testing utility

this port testing software might be useful tool for:
-developers who are working on b2b integration b/w different services and want to have tool to verify connectivity to third party servers.
-administrators who want to verify if certain servers (SQL/ftp/ssh) are up and available from work stations.
-for users who want to verify availability of specific services like msn/yahoo messengers inside network from their work stations.
We are working on mac-os version of this application.