Mendeley - Easily organize your papers, read & annotate your PDFs, collaborate in private or open groups, and securely access your research from everywhere.

Citationsy BookScanner - Scan the barcodes on the backs of books to cite them

Zotero - Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.

Citationsy - Citationsy is a reference tool to create citations, reference lists, and bibliographies.

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.

Scribbr Citation Checker - Automatically detect and resolve APA citation errors