Flow

Flow is an all-in-one project management platform that enables productive collaboration through Kanban boards, checklists, timelines, and other project tracking tools. You can create private and public projects, get real-time notifications, and set up recurring tasks.

Comments, chats, and communication channels are also available on Flow’s simple UI, making it necessary to use emails outside of the program. It doesn’t have some important integrations, though, such as with Google Calendar.