
Description: Zulip is an open-source team chat software that focuses on threaded conversations to improve productivity and organization. It has features like public/private streams, emoji reactions, integrations, and customizable notifications.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: WorldChat is a free, open-source video conferencing platform that allows users to host virtual meetings, webinars, conference calls, and other online collaboration sessions. It has user-friendly interface, supports up to 100 participants in HD video quality, provides screen sharing options,chat and other standard features.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API