Yes, Trello is a collaboration tool- and a popular one. With Trello, remote teams can coordinate with each other for completing a project. You can create different boards for different projects, and add the relevant people there. You can break up a project in different parts, and create cards for each part, and assign the cards to the person in charge of doing that part of the project. After that part is finished, the card can be moved to the next person. On Trello, board members can share links for files that they are working on, and everyone can review their work and give feedback on the card for it. Trello is a great tool for collaboration, and because it has a free version, it is very popular across the world, and a mainstay for businesses which allow remote working.