Alternatives to PDF Stacks for all platforms with any license

Zotero

Zotero is a free, easy-to-use Firefox/Chrome extension or standalone program to help you collect, organize, manage, search and cite your research sources directly in...

Free Open Source Mac Windows Linux Chrome Safari ... Microsoft Office Word LibreOffice Firefox
Browser integration Export to CSV Firefox extension Importing from webpages ... Libre Office Integration Compatible with Microsoft Office Microsoft Office integration Multiple languages Save web page for offline use Sync between devices Support for WebDAV Add a feature

237 Like
Mendeley

Mendeley helps manage and share academic knowledge: Mendeley Desktop is free academic software (Windows, Mac, Linux) for organizing and sharing research papers and...

Freemium Mac Windows Linux Web Android ... iPhone iPad
Browser integration Libre Office Integration Microsoft Office integration PDF annotation ... Real time collaboration Add a feature

246 Like
Qiqqa

Qiqqa is free award-winning knowledge-, research- and reference management software. If you're serious about getting the most from managing your publications, PDFs...

Freemium Windows Web Android Android Tablet
PDF annotation Automatic Tagging Bib Tex Sniffer Citation detection ... Content analysis Document annotations File Searching Metadata Search Portable Qualitative Data Analysis Real time collaboration Optimized for Touch screen Add a feature

296 Like
Docear

Docear is a unique solution to academic literature management, which helps you organizing, creating, and discovering academic literature. The 3 most distinct features...

Free Open Source Mac Windows Linux Web
PDF annotation Mind Map view Portable Add a feature

63 Like
- Discontinued "Update 2017-08-24: Please note that for the foreseeable future we will not continue the development of Docear as we have not enough funding and time." http://www.docear.org/2017/02/05/docears-online-services-are-down-recommendation-user-registration-backup/
JabRef

JabRef is an open source bibliography reference manager. The native file format used by JabRef is BibTeX, the standard LaTeX bibliography format.

Free Open Source Mac Windows Linux
Automatic file renaming Export citation File-sync Add a feature

71 Like
EndNote

A reference management software, used for searching online publication databases, & managing publications / bibliographies, with the ability to insert the references...

Commercial Windows Web iPad
Compatible with Microsoft Office Add a feature

33 Like
Papers

Papers helps you collect and curate the research material that you're passionate about.

Commercial Mac Windows Web iPhone iPad
No features added Add a feature

39 Like
BibSonomy

BibSonomy is a system for sharing bookmarks and lists of literature (BibTex format). When discovering a bookmark or a publication on the web, you can store it on our...

Free Web
Real time collaboration Add a feature

13 Like
Academia.edu

is a social networking website for academics. The platform can be used to share papers, monitor their impact, and follow the research in a particular field. It was...

Freemium Web
No features added Add a feature

12 Like
Paperpile

Organize your research papers in a Gmail-like web app, sync your PDFs to Google Drive and cite your references in Google Docs.

Commercial Web Chrome Google Drive Google Drive - Docs Google Scholar
No features added Add a feature

36 Like
colwiz

colwiz is free software for researchers, academics and students. The iPad, iPhone and iPod touch version sync your research articles, attachments and annotations with...

Freemium Mac Windows Linux Web Android ... iPhone Android Tablet iPad
No features added Add a feature

16 Like
Citavi

Reference management and knowledge organization with integrated task planner. Solution for work groups with data sharing in intranet available.

Freemium Windows
Knowledge base Add a feature

36 Like
Weava

Weava is a collaborative workplace for research offering an easy way to highlight, organize and collaborate on your research articles.

Freemium Web Chrome
No features added Add a feature

5 Like
Biblioscape

Software to help researchers collect and manage bibliographic data, take notes while doing research, and generate citations and bibliographies for publication.

Commercial Windows
No features added Add a feature

4 Like
EasyBib

Automatic works cited and bibliography formatting for MLA, APA and Chicago/Turabian citation styles. Now supports 7th edition of MLA. Easybib truly makes the life of...

Freemium Web Android iPhone Chrome OS Google Drive - Docs
No features added Add a feature

11 Like