Zotero

Zotero is a free, open-source research management tool that helps users collect, organize, cite, and share research. It allows users to save research from the web, organize it into collections, create bibliographies, and synchronize data across devices. Zotero also supports collaboration through shared libraries and emphasizes user privacy and control over data.

Zotero is a comprehensive research management tool that aligns well with the core features of URList, particularly in its ability to collect, organize, and share research materials, which often include URLs. It offers robust organization features, supports notes and annotations, and allows for sharing of libraries. While its primary focus is academic research, the underlying functionalities for managing web resources are very similar.