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.

CiraSync - CiraSync is a program that syncs and shares office 365 GAL contacts and calendars to smartphones.

Planyway - Visual project management for Jira and Trello: manage resources, build project roadmaps, use time tracking.

Clariti.app - Clariti is a team communication app that uses Artificial Intelligence to combine emails, chats, documents, calendar events and feeds on the same topic, in rich context-based Conversations to ensure your communication stays focused & organized.

Corrello - Dashboards for agile teams using Trello

Socialsuite - Impact measurement with measured outcomes