JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
You could set up an admin section of your form or a set of hidden fields for comments. This thread here describes how to setup a full approval workflow if you'd like:
However, if you only need the section for reviewer comments, you would only need to include the admin section and have the edit link sent to all the reviewers.