Franz is a free messaging app / former Emperor of Austria and combines chat & messaging services into one application. Franz currently supports Slack, WhatsApp, WeChat, HipChat and many more. You can download Franz for Mac, Windows & Linux.
Singlebox for Mac and PC is an all-in-one messaging & emailing app - a single place for all your web services and accounts, including Discord, WhatsApp, Messenger, Slack, Telegram and many many more.
A traybar application for Syncthing written in C++ with Qt for OS X, Windows, and Linux.
This app was discontinued on April 13, 2018.
Stay on top of business communication with your clients, easily update your team and share messages from Whatsapp and email to collaborate on work with clients.
Photino is a lightweight open-source framework for building native, cross-platform desktop applications with Web UI technology.