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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
OpenProject (although not as open as you might hope): https://www.openproject.org
Focalboard (or Boards if you use Mattermost): https://www.focalboard.com
I currently use KanBoard simply because it has a mobile app.
Mattermost has a few products/versions, i used the selfhosted enterprise version because its also MIT licensed, so free of charge and also very well documented. It may not well suited for business projects, features are build for technical teams/projects. - Features: https://mattermost.com/pricing - Deployment Options: https://mattermost.com/download/#server - Mobile Apps for both worlds: https://github.com/mattermost/mattermost-mobile An other very special app, focused on productmanagement, https://www.documize.com . Never had a scope for to use it in productive, but may match!? :)