Hello there,

Based on your requirement for a visual mapping tool that allows students to create and organize ideas and concepts, I would recommend Miro. This platform is a collaborative whiteboard designed for interactive discussions, brainstorming sessions, and group activities. It offers a collection of templates and widgets for creating engaging lesson plans and activities, including the ability to create mind maps and flowcharts.

Miro supports real-time collaboration, allowing multiple users to work on the same board simultaneously. This feature can be particularly useful for group projects or class activities where students need to organize their ideas in a hierarchical or non-linear format.

Moreover, Miro integrates with popular tools like Google Drive and Dropbox, making it easy for you to incorporate existing materials into your lessons. This could be beneficial if you have resources that you'd like to include in the visual mapping process.

Lastly, Miro offers a free Educational plan for teachers and students with a .edu email account. This plan includes unlimited active boards and custom templates, which could be useful for creating a variety of visual maps for different topics or subjects.

I hope this helps! If you have any other questions or need further assistance, feel free to ask.