Notion

Notion is an all-in-one connected workspace that blends notes, docs, wikis, databases, projects, calendar, and email into a single, modular tool - 'LEGO for software.' Founded in San Francisco in 2013 by Ivan Zhao and Simon Last, it nearly collapsed before its 2016 rebirth and has since grown to more than 100 million users, $600M+ in annual recurring revenue, and an $11 billion valuation, increasingly positioning itself as an AI workspace with built-in agents.