productboard - Beautiful and powerful product management.

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.

FastNetMon - FastNetMon is a very fast DDoS analyzer with sflow/netflow/mirror support.

KanbanFlow - KanbanFlow is a Lean project management tool allowing real-time collaboration between team members. Supports the Pomodoro technique for time tracking.

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.

Meistertask - MeisterTask is an intuitive task management and collaboration tool.