Zotero - Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.
Annotate.tv - Optimize your learning on YouTube
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.
Slid - Capture knowledge from online videos, courses, and webinars
JabRef - Graphical Java application for managing bibtex (. bib) databases.JabRef · JabRef Help · JabRef | Blog · OpenOffice/LibreOffice .
Simply.Digital - Goals & Tasks - Todo list to track your time & help set meaningful deadlines