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Hands-On Reactive Programming in Spring 5, published by Packt
Source code for the Cave of Programming Spring Framework tutorial
Spring AMQP - support for Spring programming model with AMQP, especially but not limited to RabbitMQ
Spring Integration provides an extension of the Spring programming model to support the well-known Enterprise Integration Patterns (EIP)
A sample Spring-based application
Internet forum powered by Spring Framework and MySQL 
Provides support to increase developer productivity in Java when using the neo4j graph database. Uses familiar Spring concepts such as a template classes for core API usage and provides an annotation based programming model using AspectJ