What are the alternatives to Spring that you know?

Alternatives to Spring in the Java ecosystem include several popular frameworks and libraries for application development:

• Jakarta EE (formerly Java EE): a standard platform for enterprise applications supporting servlets, EJB, JPA, and more.
• Micronaut: a modern framework with fast startup and low memory consumption, focused on microservices.
• Quarkus: optimized for containers and cloud environments, supporting reactive programming.
• Dropwizard: a simple framework for creating RESTful services with minimal configuration.
• Vert.x: a reactive framework for asynchronous applications with high performance.

The choice depends on the project requirements, architecture, and team preferences.