Trello

Trello is a visual project management tool from Atlassian based on boards, lists and cards. You create a board for a project, add lists for stages such as To Do, Doing and Done, and move cards between them as work progresses. It is simple enough for personal to-do lists and flexible enough for teams.

Cards can hold checklists, due dates, attachments, labels and comments, and Butler automation handles repetitive steps. Trello's AI features, part of Atlassian Intelligence, can help write card descriptions, summarise comments and turn notes into tasks, and an inbox lets you capture to-dos from email, Slack and other tools. Power-Ups connect Trello to apps like Google Drive, Slack, Jira and many more.

Good fit if you: want a simple, visual way to organise tasks and projects alone or with a team.
Less ideal if you: need complex project portfolios, dependencies and resource planning; heavier tools go further.

Pricing: free plan; paid Standard, Premium and Enterprise plans add more features and AI.