java-persistence

https://projects.eclipse.org/projects/ee4j.jpa

Gavin King
Emmanuel Bernard
http://in.relation.to/

Timo Westkämper  
http://querydsl.com/ | http://blog.mysema.com

Lukas Eder 
https://www.jooq.org/ | https://blog.jooq.org/

Vlad Mihalcea 
https://vladmihalcea.com | https://vladmihalcea.com/blog/
Book: High-Performance Java Persistence

Thorben Janssen 
https://thoughts-on-java.org 
Book: Hibernate Tips

Richard "Virgo" Richter virgo47
https://virgo47.wordpress.com/ 
Book: Opinionated JPA with Querydsl

Lukas Jungmann
Linda Demichiel

https://persistence.blazebit.com/
http://torpedoquery.org/
http://openjpa.apache.org/
https://www.eclipse.org/eclipselink/
https://spring.io/projects/spring-data-jpa
https://spring.io/projects/spring-data-jdbc
http://www.mybatis.org/mybatis-3/
https://ibatis.apache.org/
https://github.com/sveryovka/easy-criteria
http://uaicriteria.com | https://github.com/uaihebert/uaicriteria
http://jdbi.org/

https://github.com/vladmihalcea/hypersistence-optimizer
https://github.com/vladmihalcea/flexy-pool
https://github.com/vladmihalcea/hibernate-types