You can invite an unlimited number of collaborators to your projects. Invitees will be notified about the shared project via email and within MeisterTask itself, and the project will appear automatically in the project list on their dashboard.
Note that it is currently not possible to access projects without a MeisterTask account, so if you invite somebody to a project who doesn't have an account yet, they will be asked to sign up for a free account before being able to access the project.
How to Invite Others to Projects
Inviting people to projects is done in the Members tab in the project settings, which you can access either from within the project or from the dashboard.
1.1. From the Dashboard
Hover over the project you want to share until the ( i ) button appears and click on it to open the project settings.
1.2. From Within the Project
Alternatively, open the project itself, and click the ( i ) button in the project's top bar, then select "Manage" to reach the next step.
2. Switch to the "Members" tab and click the "Add User" button.
3. Enter the email address of the person you'd like to invite to the project. You can enter multiple addresses separated by commas.
4. To remove someone from a shared project, hover over their name in the members list until the X appears next to it, and click on it. Once removed, the project will disappear from the user's dashboard and he will not be able to access it anymore.