Mendeley - Easily organize your papers, read & annotate your PDFs, collaborate in private or open groups, and securely access your research from everywhere.
iThenticate - Prevent Plagiarism in Published Works
Zotero - Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.
Plagramme - Our plagiarism checker recognizes paraphrased plagiarism, checks your paper against more that 14 trillion documents and lets you to edit your paper online.
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.
AntiPlagiarist - AntiPlagiarist checks multiple documents for plagiarism.