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Mendeley - Easily organize your papers, read & annotate your PDFs, collaborate in private or open groups, and securely access your research from everywhere.
Basil Chat - Design feedback via chat
Zotero - Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.
Planogy - A feedback platform for all the creative work
Qiqqa - Qiqqa is a free research and reference management software. It can be used in many organizational projects from the academic to the personal to the business endeavor. Read more about Qiqqa.
Feedback by Pixelic - Painless design feedback and version control.