The Gospel Coalition (thegospelcoalition.org) is a network of Reformed evangelical churches and ministers founded by Tim Keller and Don Carson in 2005. Their website functions as the largest free evangelical resource hub in the world — thousands of articles, sermons, book reviews, and theological explainers, all freely accessible and written by leading pastors and scholars.
The theological perspective is broadly Reformed and deeply gospel-centred — closely aligned with Sydney Anglican theology. Articles are indexed by topic, book of the Bible, author, and theological theme, making it easy to find what you need for lesson preparation.