Trello is the easiest project management solution if you want simplicity. Everyone on the team can visualize task progress throughout the pipeline with its intuitive and familiar Kanban-style task management interface. There's an excellent free plan and the tool is simple to use. However, it may be too limiting for complex projects.
Trello maintains its security systems according to best practices in order to provide a secure customer experience. It performs a full backup every 24 hours which is encrypted. As a result, users are protected in case of incidents on the tool’s end that affect their entire user base - for instance, data breaches.