Downloading eSkySoftphone 3.0 from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this software available. The software is categorized as Communication Tools. This free tool was originally created by eSky. We recommend checking the downloaded files with any free antivirus.
From the developer:
eSky lets you use your Internet connection to make and receive phone calls at a fraction of what traditional telephone providers charge for the same calls. You can make Free calls to other eSky users, choose an Unlimited Monthly Calling Plan or Pay-as-you-go with our Prepaid Calling which is based on our Low Per Minute International Rates.
You may want to check out more software, such as Mojicon, eXeSMS or PHP Live! Support, which might be similar to eSkySoftphone.