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FeedbackFruits offers several Blackboard integrated feedback plug-ins. 

The plug-in FeedbackFruits Peer Review can help streamline the peer feedback process. As an instructor, you create a rubric in advance with various feedback criteria on which the submitted work should be graded. After the assignment submission deadline, students are automatically assigned to each other. Students can, in addition to filling in the feedback criteria, select specific pieces in the text to give feedback on. Based on the peer feedback received, the student can then improve the assignment. 

Want more theoretical background on working with online (peer) feedback? Then check out the online module on (Peer) feedback, you can log in with Solis-id.