1. GraniteORM Model with Adapters for mysql, pg, sqlite in the Crystal Language.
2. AmberA Crystal web framework that makes building applications fast, simple, and enjoyable. Get started with quick prototyping, less bugs, and blazing fast performance.
3. MicrateDatabase migration tool written in Crystal
4. docsDocumentation for Amber Framework
6. quartz-mailerA library to get started in sending and receiving emails from and to your Crystal application