Task Coach - Task Coach is a simple open source todo manager to keep track of personal tasks and todo lists.

Microsoft Teams - Microsoft Teams provides the enterprise-level security, compliance and management features you expect from Office 365, including broad support for compliance standards, and eDiscovery and legal hold for channels, chats, and files.

Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.

Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.

Strikethru - Strikethru is a kind of to-do list notebook for managing work lists and staying updated with the important tasks.

Creativity 365 - Cross-device content creation suite