Diagrams for Mac - A diagram editor for visualizing structures and processes

productboard - Beautiful and powerful product management.

The Data Visualisation Catalogue - Reference tool for data visualisation

Aha - Aha! is the new way to create visual product roadmaps. Web-based product management tools and roadmapping software for agile product managers.

nivo - nivo provides a rich set of dataviz components

ProdPad - ProdPad helps your team gather ideas, surface the best ones and turn them into product specs, and then put it all on a product roadmap.