Bookmark managers with file uploads
Bookmark OS is like Mac and Windows for bookmarks. It gives an intuitive and powerful interface for organizing your bookmarks.
Clipix is like a cross between a start page and Pinterest. The layout is very similar to Pinterest but you can bookmark more than just images.
Bookmarkme is another visual way to organize your bookmarks using a card-like manner. It also supports tags, collaboration, and reminders.
Bublup allows you to save bookmarks, files, and notes in folders with pictures on them. Bublup also has folder sharing and collaboration.
Collect allows you to organize links and images visually into boards. Has sharing and collaboration.
Memosnag let's you organize your bookmarks in lists within different categories. You can save articles, text, and images and collaborate with others on collections.
Cling has a layout that is similar to a start page but is slightly different in that the panels have lists of items. These items can also be notes, bookmarks, to-dos, and files.
Pearltrees is similar to other card based visual bookmark managers such as Clipping Mini and Lasso. It allows you to organize bookmarks in a grid with screenshots.
Zotero bills itself as your personal research assistant. It allows you to add citations and organize bookmarks in a list-based style.