Anki
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
Wiktionary
Description: Wiktionary is a free, collaborative, multilingual dictionary project operated by the Wikimedia Foundation. It aims to describe all words of all languages using definitions, etymologies, pronunciations, synonyms, and more.
Type: software