The Community Edition is the best option for groups with up to 20 users.
It includes ONLYOFFICE Docs and a range of business tools such as mail, CRM, document and task management, calendar, chat, polls, and more. OnlyOffice Workspace allows you to create a web office from your own server. It can be integrated into existing platforms or used to replace an existing component. You can also track changes, version history, compare documents and use the built-in chat.
You can co-edit documents, spreadsheets, presentations and fillable forms in real-time with your team: you have two editing modes (real-time or paragraph-locking), commenting and built-in chat.
ONLYOFFICE Docs, an online office suite, offers a wide range of collaboration features.