RemNote
Description: RemNote is a free, open-source spaced repetition and note-taking app. It uses an interconnected web of notes to promote understanding and long-term memory retention. Key features include note linking, spaced repetition flashcards, knowledge graphs to visualize connections, and excellent mobile apps.
Type: software
Pricing: Open Source
Yahoo! Messenger
Description: Yahoo! Messenger is an instant messaging client and associated protocol provided by Yahoo!. It allows users to communicate in real-time through text, voice, video chat, and file sharing. Popular in the early 2000s, it has since declined in usage with the rise of smartphones and other messaging apps.
Type: software