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.
OBS Studio - Free and open source software for video recording and live streaming for Mac, Windows and Linux.
LimeSurvey - LimeSurvey: the Online-Umfrage Tool - Open-Source Suryeys
Snagit - Screen Capture Software for Windows and Mac
Quizlet - Quizlet allows you to review and create flashcards for a variety of subjects, such as math and reading.
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.