If you would like to view a working demonstration of Open Journal Systems software before signing up, a sample journal is available here on the Public Knowledge Project's site.
For potential users who want to test specific OJS features, as a Journal Manager, Editor, or a Reviewer, the Public Knowledge Project offers a separate test site for trial use.
Use admin as the username and testdrive as the password. Select any available role, and feel free to use the PKP-provided demonstration. You may submit a test manuscript, assign reviewers, and act as a reviewer, to evaluate the experiences of authors and reviewers.
One cautionary note: everything that you enter into the demonstration journal is wiped clean at the beginning of each week.