Mochi - Write notes and flashcards with Markdown and study them with spaced repetition.
Sans Forgetica - Scientifically designed font to help remember study notes
Bookmark It - Create awesome notes on YouTube videos
conotes.io - Generate PDFs in Cornell format within your browser
Jot - The no-fuss way to take notes
AnkiApp - AnkiApp is a flashcard app for iOS (iPhone + iPad), MacOS, and Android. Get flashcards on any topic. Tracks progress and syncs automatically.