Redmine - Flexible project management web application

Microsoft 365 - Boost your productivity with reliable access anywhere with services like email, calendar, file sharing, meetings, instant messaging, and Office Online

Asana - Asana project management is an effort to re-imagine how we work together, through modern productivity software. Fast and versatile, Asana helps individuals and groups get more done.

Cybozu Office - 外出先からのスケジュール管理など情報共有がカンタン、安心。しかも無料でお試しいただけます。★現在サイボウズ Office パッケージ版ご利用の方へ：クラウド版への無料移行ツールをご用意しました。クラウドのレスポンスの速さをお試しください。

Feng Office - Feng Office is a commercial Open Source web based solution aimed to enhance collaboration and productivity

Quip - Quip is the modern productivity suite that simplifies your life and helps your team get work done faster.