Trello (Task Management) - https://trello.com/
Slack (Collaboration) - https://slack.com/
Whereby (Video Conference) -
Stanuply (Automated Standup organizer) -https://standuply.com/
Office365 - https://www.office.com/
Evernote - https://evernote.come
GitLab (Project settings, project related information) - https://gitlab.com/