PlanITpoker - PlanITpoker is a cool on-line planning poker app that helps Agile project teams estimate projects easily.
Aeon Timeline - "The timeline tool for creative thinking. Capture, create and explore ideas."
Taiga - Project management platform for agile developers & designers
Preceden - Preceden makes it easy to build simple, powerful timelines
Craft.io - All-in-one product management software for entire product lifecycle
ChronoFlo Timeline Maker - Create beautiful interactive timelines that you can share online