If you are looking for an easy to use tool to manage various projects online, Trello may be for you. You can use Trello collaboratively as a team, or individually. Trello allows you to create boards for various projects. In each board, you can then create to-do and checklists, attach files, organize projects, and more. Trello can integrate other apps such as google drive, slack, and more. Trello offers a free basic version which gives you access to many of the project management functions. You can also upgrade to the business version for $10 per user per month or the enterprise version which is $20 per month for up to 100 users.