Mendeley - Easily organize your papers, read & annotate your PDFs, collaborate in private or open groups, and securely access your research from everywhere.
ReadingGoals - Tackle your "Read Later" bookmark debt in 2020
Zotero - Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.
Matter - Create a feedback-focused culture in Slack with Matter!
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.
Alfread - Actually read articles saved for later