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

AlternativeTo - AlternativeTo lets you find apps and software for Windows, Mac, Linux, iPhone, iPad, Android, Android Tablets, Web Apps, Online, Windows Tablets and more by recommending alternatives to apps you already know.

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

Alternative.me - Welcome to alternative.me, the source of better software alternatives. Finding suitable software was never easier.

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.

StartupResources.io - Tightly curated lists of the best startup tools