The Neo4j GraphGist challenge was a competition where developers were invited to create interactive visualizations using Neo4j's graph database. The challenge received high-quality contributions, with three winners: Johannes Mockenhaupt for his "Learning Graph" contribution, Nicole White for her "US Flights & Airports" contribution, and Wes Freeman for his "Chess Games and Positions" contribution. Each winner was recognized for their creative use of Neo4j's Cypher queries and data models to visualize complex information in an interactive way. The challenge also highlighted the evolving GraphGist project, which now includes features such as Math formulas, Disqus integration, and improved styling.