Many in WRAC use Eli Review as a tool to facilitate peer-review and/or archive student writing.
From the Eli Review website:
Overview: Eli Review is a set of tools that help instructors run feedback-centric classrooms. Designed by writing teachers frustrated by a lack of technology to support their work, every feature in Eli is grounded in writing and learning theory.
With Eli Review, teachers can help students give and get better feedback and coach them in effective revising skills, the two skills that research has proven to be the most effective for learning. With Eli, teachers can help students be better writers.
Eli Review provides a robust explanation of how teachers can use Eli Review in their courses.
It is free for students and instructors at MSU.
What's more, Eli Review can be added directly to and supported by your D2L sites. MSU outlines that process here.