FlashcardExchange - is a tool to create flashcards, saving you a lot of time.

Time edition – helps you track how much time you spend learning.

PocketMod – can help compress your study material into small blocks – for example, you can store all your math formula details together on one page. Whip it out when you want to learn them by heart.

Web Seavus Dropmind and MindMeister are two online packages that can help you create Mindmaps.

Some best content resources for subjects, especially Math and Science online, are Khan Academy, Brilliant, Virtual Nerd, STEM, Desmos, GeoGebra, CanFigureIt Geometry, and PhET Interactive Simulations, and CueThink.