Redmine

There is no official Redmine demo anymore. See Redmine demo and also https://demo.redmine.org is down.

However there is:

• This very instance, where you can get a grasp of what Redmine does. For e.g. https://www.redmine.org/projects/redmine/issues

And a couple of unofficial demos I could find:

• https://redminedemo.saas-secure.com/ a good resource. You may need to change the configuration a bit, when I went there, the language was set in German!
• https://redmine-demo.alphanodes.net/ and credentials are here https://alphanodes.com/redmine-demo.
• https://demo.redmine-kanban.com/ mainly to showcase their plugin but it also works as a Redmine demo.