Flow - Stop managing projects from your inbox.
Intercom on Product Management - The ultimate resource for aspiring product managers
SlimPlanner - Team scheduling, resource planning, task management
Product School - The global leader in product management training
Asana - Asana project management is an effort to re-imagine how we work together, through modern productivity software. Fast and versatile, Asana helps individuals and groups get more done.
The Product Management guide - A book on how to create and ship products that people love