Downloading ExpressTalk 4.36 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available. Talkmaci.zip is the frequent file name to indicate this program's installer.
The actual developer of this software for Mac is NCH Software. 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.
ExpressTalk for Mac lies within Communication Tools, more precisely Texting & Video calls. The unique identifier for this program's bundle is com.NCH Swift Sound.ExpressTalk. The following versions: 4.0 and 2.0 are the most frequently downloaded ones by the program users.
From the developer:
ExpressTalk makes phone calls using your PC, Mac or Pocket PC. It works like a telephone to let you make calls through your computer. This tool works with almost any VoIP gateway provider or office PBX, is provided with business features such as call transfer, conferencing and recording.
You may want to check out more Mac applications, such as Rynga, I'm Away - IM status changer or Retroshare, which might be related to ExpressTalk.