The best alternatives to All-in-One Messenger are Franz Messenger, Rambox, and IM+ for Mac. If these 3 options don't work for you, we've listed a few more alternatives below.
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Rambox is a workspace organizer that allows you to unify as many applications as you want, all in one place. It is perfect for those who care about productivity while working with many business and personal apps.
Collect all your notifications in one place. Filter them with tags and filters by app. Organize your workspace and don't lose notifications in the flow