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PlanSwift - PlanSwift allows contractors to create accurate project estimates specific to their individual trade.
Zotero - Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.
ZotFile - Zotfile is a Zotero plugin to manage your attachments: automatically rename, move, and attach PDFs...
Mendeley - Easily organize your papers, read & annotate your PDFs, collaborate in private or open groups, and securely access your research from everywhere.
PdfHighlights - PdfHighlights extracts and exports all your PDF highlights and PDF annotations from all your PDF files into a single report.
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.