Symbaloo

Symbaloo is an online bookmark manager and personal homepage creator, primarily aimed at educators. It allows users to save, organize, and share web links and resources into visual 'webmixes' (collections of tiles). Users can customize their homepages and access their curated content from any device.

Symbaloo is a strong match for URList's core features. It explicitly offers saving and organizing links into 'webmixes' (lists/sections), and allows for public sharing of these webmixes. The platform emphasizes ease of saving and a clean interface. While it doesn't explicitly mention 'Tufte-style side notes', it does allow for adding context to tiles. The focus on 'homepage' and 'personalization' aligns with the profile gateway concept. The primary difference is its target audience, which is heavily skewed towards educators, but the core functionality aligns well.