Another new plugin added to the Moodle plugins database is Student Folder which allows the students to upload documents which can be made visible by teachers.
Acc. to the plugin description:
The student folder has two features: on the one hand participants can upload their documents in the student folder which can be made visible for other students immediately after the upload or after the teacher’s approval. On the other hand it is possible to import documents from the activity assignment. Here teachers can decide which documents should be visible to all participants or name individual students to release documents.
You can download the plugin from the Moodle plugins database through this link. The plugin is developed by AMC Academic Moodle Cooperation and is available for Moodle 2.7 & 2.8 versions.