Benubird PDF has been discontinued. Similar apps include Mendeley, which has a free version. Other options are Qiqqa, Tabbles, Paperpile and ReadCube Papers. There's no shortage of Document Managers like Benubird PDF, with more than 25 alternatives for Mac, Windows, the web, iPhone and iPad.
Mendeley helps manage and share academic knowledge: Mendeley Desktop is free academic software (Windows, Mac, Linux) for organizing and sharing research papers and generating bibliographies with 1GB of free online storage to automatically back up and synchronize your library...
Netherlands
EU
Qiqqa is a free research and reference manager. Search for, read and annotate your PDFs. Then review your work, write up and create bibliographies instantly.
United Kingdom
Uses a visual, tag-based system to categorize files and folders without moving or duplicating them, enabling ad hoc combination of tags for intuitive search and retrieval, supporting large document collections and visual category management for greater flexibility.
ItalyEU
Organize your research papers in a Gmail-like web app, sync your PDFs to Google Drive and cite your references in Google Docs.
Papers helps you collect and curate the research material that you're passionate about. This award-winning reference manager will improve the way you find, organize, read, cite, and share.
United States
Reference management and knowledge organization with integrated task planner. Solution for work groups with data sharing in intranet available.
Switzerland
PDFKeeper is free, open source document management software that integrates with a compatible, relational database to provide a centralized storage and management solution for PDF documents.
wizdom.ai (formerly colwiz) is a free and comprehensive research management software for researchers, academics and students. With the wizdom.ai android app, you can search, add and manage publications in your wizdom.ai library on the go. Sync instantly across wizdom.
United Kingdom
Automatic works cited and bibliography formatting for MLA, APA and Chicago/Turabian citation styles. Now supports 7th edition of MLA.
United States
BibDesk is a bibliographic reference manager for Mac OS X. BibDesk is designed to help organize and use bibliographic databases in BibTeX .bib format.
With PDF Stacks, you can organize, find and browse, search, annonate and share your collection and library of PDF files, papers, research and journal articles with a single click. It saves you time: no more wondering around your computer to find a PDF file.
United States
Bookends is a commercial reference management software package for Mac OS X that is used to manage bibliographies and references when writing essays and articles. Its target market is students, academics and professionals.
United States
