OBS Studio - Free and open source software for video recording and live streaming for Mac, Windows and Linux.
Anki - Anki is a program which makes remembering things easy. Because it's a lot more efficient than traditional study methods, you can either greatly decrease your time spent studying, or greatly increase the amount you learn.
Snagit - Screen Capture Software for Windows and Mac
LimeSurvey - LimeSurvey: the Online-Umfrage Tool - Open-Source Suryeys
Loom - Loom is a screen recording extension for Chrome that gives people the ability to create and share media. Create your own videos using your camera, screen view, and audio. Read more about Loom.
Quizlet - Quizlet allows you to review and create flashcards for a variety of subjects, such as math and reading.