Pocket

Pocket is a popular 'read-it-later' service that enables users to save articles, videos, and other web content from various sources. It provides tools for organizing saved items into collections and offers a clean interface for reading and discovering new content. Users can also share their saved content.

Pocket is a well-known read-it-later service that allows users to save articles, videos, and other web content for later consumption. It offers features like saving URLs with previews, organizing content into collections (lists), and sharing. While it doesn't explicitly mention 'contextual side notes' in the Tufte-style, it does allow for saving and organizing content, which aligns with the core concept. The website also indicates a minimalist interface and public sharing capabilities.