Product School - The global leader in product management training
FastNetMon - FastNetMon is a very fast DDoS analyzer with sflow/netflow/mirror support.
The Product Manifesto - Product Managers face the biggest challenges of our day, which is why our community needs a common set of product principles.
Arbor - Easily manage product development
Intercom on Product Management - The ultimate resource for aspiring product managers
Corero - Real-time, high-performance, automatic DDoS attack protection, on-premis and in the cloud, with comprehensive attack visibility, analytics, reporting.