Spring Object/Relational Mapping which provides integration layers for popular object-relational mapping APIs, including JPA, JDO, and Hibernate.

Spring Data module for JPA repositories.

Pac4j: Java Web Security For SAML

Spring Data REST - WebMVC

Camel JPA support

DSpace core data model and service APIs.

Spring Integration JPA Support

Liquibase extension for hibernate integration including generating changesets based on changed hibernate mapping files

Persistence and Object/Relational Extensions, Utilities, and Data Types

Some libraries to do simple tasks simply

Custom Hibernate types for serializing fields as JSON, using either jackson or gson