Heptabase

Heptabase is a visual knowledge management tool that combines notecards with an infinite whiteboard. Users create cards in a journal and then spatially organize them on whiteboards to see the big picture and make connections. It excels at visual thinking, literature reviews, and project planning. It's designed for visual learners, researchers, and product planners.

Pricing is subscription-based. It scores well for its unique, effective hybrid approach that bridges the gap between atomic notes and high-level visual synthesis, making complex topic mapping intuitive.