A Trello board is a list of lists, filled with cards, used by you and your team. It’s a lot more than that, though. Trello has everything you need to organize projects of any size. Open a card and you can add comments, upload file attachments, create checklists, add labels and due dates, and more.
Trello works in real-time, real fast. When somebody moves a card, it moves on your board instantly, no matter what device you use. You can keep your tab open all day and never have to refresh. Plus, Trello opens and loads so fast you won’t even notice.
You can invite any user as a collaborator on a project. Please note any collaborator in a shared project can add or edit any tasks.Task Management Tools Todoist
Though we don't have a dedicated feature to track issues, Todoist should flexible enough to handle it by using labels, tasks, due dates, and comments.Task Management Tools Todoist
Yes, you can. Turn emails into tasks in the click of a button and never forget to follow up on important messages.There are 3 ways to keep your email organized with Todoist:Download our apps for Gmail and OutlookForward emails to Todoist (Premium-only)Use a 3rd-party integrationTask Management Tools Todoist
Currently we don't really have subtasks. We use checklist items for that purpose.You can track, if they are completed or open and you can also convert a checklist item to a task. It fulfils the purpose of a subtask in our experience.Task Management Tools MeisterTask
Yes, we have built an extra add-in to create tasks via outlook and gmail:The MeisterTask for Outlook add-in turns your emails into tasks and automatically inserts them in the project and section of your choice. TheTask Management Tools MeisterTask