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.
Airtable is a low-code platform for building collaborative apps, and it's a new type of online table-making tool that can combine text, pictures, links, documents and other materials together, to help you customize a personal database.
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.