Green Submissions is described as 'Completely free to everyone. Environmentally friendly and simple to use. (Quickstart Guide) Writers submit by plain text or as an attachment. Advanced tools for writers allowing edits and withdraws. Powerful tools for publishers that are simple to use'. There are three alternatives to Green Submissions, not only websites but also apps for Android, Android Tablet, iPad and iPhone. The best alternative is Evalato. Other great sites and apps similar to Green Submissions are Untap Compete (Paid) and Submittable (Paid).
Submittable is an easy-to-use online submission manager. It allows users to have a single login to submit to a variety of publications, and for editors to read, rank, review, and communicate about submissions, as well as automatically track and send messages to authors.