Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.

Akeneo - Akeneo is an open-source Product Information Management solution.

Drag for Gmail - Transform Gmail into organized To Do lists (like Trello)

Webcollage - Webcollage is a SaaS solution enabling brands to manage rich product information and publish it in real time to retailer websites.

KanbanMail - A Kanban board for your emails.

Perfion - Perfion offers PIM solutions for organizations to use it across all their present and future marketing and commerce channels.