Zulip is an open-source team collaboration tool with unique topic-based threading that combines the best of email and chat to make remote work productive and delightful. Zulip is the only modern team chat app that is designed for both live and asynchronous conversations. Zulip combines the immediacy of real-time chat with an email threading model. With Zulip, you can catch up on important conversations while ignoring irrelevant ones.

Features of Zulip:

• Open Source: Zulip is free and open-source software (FOSS), which means you can download, install, and customize it to meet your organization's specific needs.
• Real-time and Asynchronous.
• Search and Message History

Disclaimer: Apps4Rent does not offer commercial licenses of any of the products mentioned above. The products come with open-source licenses. 

Default ports:

• RDP: 3389
• HTTP: 80
• HTTPS: 443

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Managed Azure services
Solutions on Microsoft Azure