Nuclino

Nuclino is a lightweight, real-time collaborative wiki that organizes content into workspaces and items. It offers multiple views: list, board, graph (mind map), and table. It's fast, minimalist, and great for creating internal documentation, team directories, and project specs without overhead. It targets small to medium-sized teams needing a simple but powerful shared brain.

It has a free plan for up to 50 items and paid tiers. It ranks for its speed, clean interface, and visual graph view that helps visualize relationships between topics.