Description: Anki is a free, open-source flashcard program that uses spaced repetition to help users memorize information more efficiently. It allows users to create digital flashcards with text, images, audio, videos, and LaTeX support. Anki's algorithm schedules flashcards to show up at increasing intervals based on the user's performance to reinforce long-term memory.
Type: software
Pricing: Open Source
Description: Google Sidewiki was a social annotation tool that allowed users to make comments and annotations alongside web pages from 2009 to 2011. It enabled collaborative annotation functionality for information on websites.
Type: software