productboard - Beautiful and powerful product management.
Nifty - Manage projects, work, and communications in one place.
FastNetMon - FastNetMon is a very fast DDoS analyzer with sflow/netflow/mirror support.
ZenHub - ZenHub is how the world's best software teams work together. Trusted by NASA, Docker, and Rackspace. Start free today!
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.
Intercom on Product Management - The ultimate resource for aspiring product managers