No specific info about version 5.4. Please visit the main page of zoiper on Mac Informer.
FaceTime for Mac makes it easy to talk, smile and laugh with friends and family on their iPhone 4, iPad 2, iPod touch or Mac.
iMessage lets you send messages to anyone on a Mac, or an iPhone, iPad, or iPod touch running iOS 5.
Say “hello” with an instant message, voice or video call – all for free.
Send messages, have group chats, and share pictures using the Whatsapp services.
This program is a converged Internet communication tool.