They offer a a free usage during the first year.
- Amazon Aurora
- RDS for MySQL
- RDS for PostgreSQL
- RDS for MariaDB
- RDS for Oracle
- RDS for SQL Server
- Amazon RDS Custom
They have free 512MB / project.
- MongoDB database hosting
They have a free plan forever with free backups.
Managed PostgreSQL database service. 1 database, 10GB storage, 1 CPU and 1GB Memory (burst).