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.
Planyway - Visual project management for Jira and Trello: manage resources, build project roadmaps, use time tracking.
Hygger - Hygger - is an Agile project management tool with built-in prioritization.
Corrello - Dashboards for agile teams using Trello
Codegiant - Codegiant - Issue tracking, git repositories, continuous integration and documentation in a single platform.
Toby for Teams - Better bookmarks, now with collaboration baked in 🔖