Question: Is there an open-source project management tool that offers a Kanban Board and rich-text editor for efficient task management?

If you're looking for an open-source project management tool with a Kanban Board and rich-text editor, AppFlowy is worth a look. It's an all-purpose tool for project management, note-taking and team collaboration that's designed to be easy to use. AppFlowy offers a Kanban Board for project management and a rich-text editor that can be customized with various blocks. It also offers offline support with synchronization so you can use it anywhere. The tool is highly customizable with plugins, templates and themes. It's available on desktop and mobile devices and has a free version, and there's an active community that helps develop it.

Another good option is Notion, an all-purpose workspace that lets you manage projects and collaborate with your team. Notion offers customizable blocks, a drag-and-drop interface for creating pages, and AI-powered help for visualizing data and filtering information. It can be used for a variety of tasks like company wikis, product roadmaps, meeting notes and habit trackers. Notion is free to use, with optional AI add-ons, so it's a good option for teams that want a flexible and relatively inexpensive tool.

If you prefer a more traditional project management style, Trello offers a Kanban Board and a variety of views for managing tasks and tracking progress. Trello's integration with other tools is powerful, and its pricing plans are flexible for teams of any size. It offers templates and automated workflows to help you keep projects on track and meet deadlines.

If you're looking for a visually oriented project management tool with AI help, Workstreams.ai could be a good fit. It offers customizable Kanban boards and workflows, integrates with Slack and Microsoft Teams, and offers features like task automation and time tracking. It offers a free plan for up to three team members and several paid plans, so it can accommodate teams of different sizes and budgets.