Download of One Chat - All In One Messenger 4.9.6 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. This software for Mac OS X was originally produced by AppYogi. 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. One Chat - All In One Messenger for Mac relates to Communication Tools.
From the developer:
One Chat - All In One Messenger combines chat and messaging services into one simple Mac application. Therefore, the program integrates WhatsApp, Facebook Messenger, Hangouts, Telegram, Skype, Slack, WeChat, and HipChat. You can send and receive photos, videos, documents, and PDFs directly from your PC.
You may want to check out more Mac applications, such as Rocket.Chat, Go for Messenger: Voice & Text Message Chat or CometChat Messenger, which might be related to One Chat - All In One Messenger.
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