Tagpacker

Tagpacker is a free web-based tool designed for collecting, organizing, and sharing web links. Users can save links, categorize them with tags and 'tagpacks,' and share their curated collections publicly. It also offers features like browser extensions, import/export options, and an API for integration.

Tagpacker is a strong match for URList. It explicitly states its purpose is to "collect, organize, and share your favorite links," which directly aligns with URList's core value proposition. It offers features like a "Pack it" button for instant link adding, organization via tags and "tagpacks" (similar to lists and sections), and public sharing of content. The site also mentions a clean and responsive design, user profiles, and the ability to embed collections, all of which are features of URList. While it doesn't explicitly mention 'Tufte-style side notes,' it does allow for comments on content, which serves a similar contextual purpose.