Video conferencing is a technology that allows users in different locations to hold face-to-face meetings without having to move to a single location together.
Jitsi is a set of open-source projects that allows you to easily build and deploy secure video conferencing solutions. At the heart of Jitsi are Jitsi Videobridge and Jitsi Meet, which let you have conferences on the internet, while other projects in the community enable other features such as audio, dial-in, recording, and simulcasting.
Nextcloud Talk is a fully self hosted, on-premises audio/video and chat communication service. It features web and mobile apps and is designed to offer the highest degree of security while being easy to use.
Nextcloud Talk lowers the barrier for communication and lets your team connect any time, any where, on any device, with each other, customers or partners. Message status indicators show when a message is sent and received – for more privacy, users can disable this on their side. The Nextcloud Talk High Performance Backend enables enterprise class scalability, reliability and features.
Element is a messenger that gives you the privacy you expect from a conversation in your own home, but with everyone across the globe. You can use it for free by using any of the public Matrix servers available. If you want your own dedicated decentralized Matrix network, you go with paid hosting plans on Element Matrix Service.
BigBlueButton is completely open-source and was created by a community of dedicated developers passionate about helping improve online learning. It is constantly evolving and improving through a dedicated, growing international user and developer community.