Annotate.tv - Optimize your learning on YouTube
Mendeley - Easily organize your papers, read & annotate your PDFs, collaborate in private or open groups, and securely access your research from everywhere.
Slid - Capture knowledge from online videos, courses, and webinars
Zotero - Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.
SkillTube - A curated list of best courses from YouTube & other platform
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.