The text introduces four example apps for building modern applications using Fly, an application platform that helps developers deploy their apps quickly and efficiently. These apps include Redis, a fast key/value database; MinIO, an S3-compatible object store; Gogs, a private Git server with issue tracker and web hooks; and MQTT, a messaging protocol for apps and devices. The text also encourages users to explore the Fly community site for discussions, tips, and support in deploying their applications on Fly.