Microsoft's complete, collaborative work platform provides everything needed for team-based communication. Its distinctive integration with 
Microsoft 365 for easy sharing of documents makes it one of the best options for groups already using the office suite. The platform is available for both businesses and education needs.
Similar to 
Microsoft Teams in communication capability but different in focus, ZOOM offers a cloud video conferencing service that makes it totally practical to conduct meetings online. It's an excellent choice for those who don't need Microsoft 365 integration and it works great for holding work meetings and conducting online classes.
Moodle lets you manage educational content through your own server totally for free or through a subscription-based cloud service. The LMS (learning management system) offers practically limitless features through its plugin ecosystem. This may require a bit of time in configuration but it's a powerful system for tech savvy educators or businesses needing flexibility.
A commercial LMS solution similar to 
Moodle, Edmodo makes it very easy for teachers to conduct class online through a familiar, social networking interface. It's not plugin-based like Moodle, which can make it a simpler system to work with.
Another great option for educators, Google offers a fast, easy and free way to hold classes online. Unlike the other LMS services mentioned, this one simply isn't available for business use. That tends to make it easier to use, and being Google based makes it easier for many users to get started.
Kahoot! makes it super easy for educators to create fun and engaging quizzes that can be played with live interaction. The app uses a proven formula that students across the world have enjoyed and it's now available for both educational and business use.
Presentations are a must for both work and school and Prezi fills that need with a super simple but very stylish way of presenting content. Easily create zooming and panning slideshows explaining class concepts or business matters.
