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.
Live Chat by Sumo.com - Instantly communicate with customers, prospects & visitors
Planyway - Visual project management for Jira and Trello: manage resources, build project roadmaps, use time tracking.
Tolstoy - Communicate with interactive videos
Corrello - Dashboards for agile teams using Trello
Live Chat by Landbot - Live chat that combines chatbots with human chat