Microsoft Teams combines video conferencing software with team collaboration tools. It is a workspace chat and videoconferencing tool, with file storage, and integration with other applications.
Video meeting and conferencing tool.
An online calendar tool for time management and coordinating meetings, including polling for a mutually good time. Can be connected to your calendar.
Zoho Survey is an online survey tool.
You can use Google Forms to create forms, surveys, and quizzes as well as to collaboratively edit and share the forms with other people.
Whereby is a video chat/conferencing tool that does not require any downloads.
Jitsi is a free, secure, and open source video conferencing with collaboration functionality, video directly in browse. No downloads required.