Flowdock is described as 'beautiful group chat. You can upload files, paste blocks of text, use #hashtags to make notes or create lists and mention others’ names to get their attention' and is an website in the Social & Communications category. There are more than 50 alternatives to Flowdock, not only websites but also apps for a variety of platforms, including Android, iPhone, Mac and Windows. The best alternative is Slack, which is free. Other great sites and apps similar to Flowdock are Quire (Freemium), Mattermost (Freemium, Open Source), Basecamp (Freemium) and Microsoft Teams (Freemium).
PrivMX is safe and easy collaboration software for all kinds of teams, with virtual workspace protected by end-to-end encryption. Each team uses desktop/laptop client software and its own (zero-knowledge) PrivMX Team Server.