Microsoft Teams is an effective chat-based collaboration tool that can keep all your team's chats, meetings, files, and apps together in one place, making it convenient for working online and share info. Users can sign up for free.
DingTalk (DingDing) is a free, professional and feature-rich office tool and collaboration platform for enterprises or organizations. It's the best working from home app for study online and works online from home.
Taskade is a real-time organization and collaboration tool for remote teams. With a set of functions to help team members to get things done faster and smarter. Taskade is the simplest way to create team outlines, checklists, and workflows.