Nuclino

Nuclino is a collaborative workspace designed to bring knowledge, documents, and projects together in one place for teams. It offers features like real-time collaboration, various views for organizing content (list, board, table, graph), and an AI-powered 'Sidekick' for content generation, summarization, and answering questions based on team content. It aims to streamline workflows and reduce context switching by providing a unified platform for team productivity.

Nuclino is a team collaboration and knowledge management tool, which differs significantly from URList's focus on personal URL curation and sharing. While Nuclino allows for organizing content (documents, notes) into workspaces and items, and offers sharing capabilities, it doesn't specifically focus on 'URL saving and preview' as a primary feature with rich media previews for external links. It's more about creating and collaborating on internal documents. The 'contextual side notes' feature is not explicitly present in the Tufte-style as described for URList. However, it does offer organization, public sharing of workspaces, a minimalist interface, sign-in, granular permissions for content, mobile responsiveness, and embed support for its content.