There are a number of online collaboration tools that can be useful for online learning projects. Some of these tools include Google Docs, Microsoft OneDrive, and Slack.

Google Docs is a free online document-creation and collaboration platform that can be used to create and share documents with other users. Google Docs can be used to create and edit documents together, and can be shared with other users via email, Google Drive, or a document sharing service such as Dropbox.

Microsoft OneDrive is a cloud-based storage and collaboration service that can be used to store and share documents with other users. OneDrive can be used to create and edit documents together, and can be shared with other users via email, Google Drive, or a document sharing service such as Dropbox.

Slack is a messaging platform that can be used to communicate with other users. Slack can be used to create and manage teams, and can be used to send and receive messages, files, and images. Slack is free to use for up to 5 users.