Internet Call Manager 8.1 for Mac was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The program is included in Internet & Network Tools. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe.
From the developer:
Internet Call Manager is the cost-effective solution to the problem of missed calls while your phone line is busy because you're on the Internet. It is ideal for anyone who wants the freedom to be on-line. You can comfortably do everything you do on the Internet worry-free while ICM monitors your telephone line.
You may want to check out more software for Mac, such as InternetMediaManager, Desktop Call Assistant or Home Loan Manager Pro, which might be related to Internet Call Manager.
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