Gerasimos Tsiamalos

Most of the “related posts” plugins out there while they provide some kind of control on how to create related posts, they all rely on an algorithm 
and the results are automatic. With CPR you get total control as you can manually select the posts that you want to relate.

Custom Post Relationships (CPR)

This plugin will let you create custom post relationships.

Anastis Sourgoutsidis

Most of the “related posts” plugins out there while they provide some kind of control on how to create related posts, they all rely on an algorithm 
and the results are automatic. With CPTR you get total control as you can manually select the posts that you want to relate.

Custom Post Types Relationships (CPTR)

This plugin will let you create custom post relationships among posts, pages and custom post types.

Custom Post Relationships (CPR) vs Custom Post Types Relationships (CPTR)