Spranto 2.8 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The most popular versions of the tool are 2.8, 2.6 and 2.5. We recommend checking the downloaded files with any free antivirus. The program's installer file is commonly found as Spranto.exe. Spranto lies within Communication Tools, more precisely Instant messaging. The actual developer of the software is Spranto Australia Pty Ltd.
From the developer:
Spranto is a powerful video conferencing client capable of sending and receiving full 1080p HD video and content. Spranto utilizes the industry standard H.323 protocol, so you can call Cisco, Polycom, Lifesize, Tandberg, Codian, and Radvision devices, including MCUs, conference room and class room endpoints.
You may want to check out more software, such as WinPopup Speak, LAN Chat or Vista Caller-ID, which might be similar to Spranto.