The Chaos Cosmos library currently includes vegetation, materials, furniture, accessories, lighting fixtures, vehicles, people, animals, architecture, presets (i.e. ready-to-use predefined sets of 3D models like grass and dandelion lawns, tree avenues, river stones, wild bushes, palm forest, hedges, group of people and more), enmesh-patterns and HDRI skies, organized in four main categories and nine spaces. The main categories include 3D models, materials, HDRIs, and collections. Under collections, you will find the V-Ray and Corona material libraries, as well as 3D assets categorized into Asian and Scandinavian styles. Under spaces, you will find assets appropriate for living room, kitchen and dining, bathroom, bedroom, office, restaurant and café, retail, urban, and country styles.
For more, check the Chaos Cosmos website.