From Mono Software:
Knorg (short for Knowledge Organizer) is a tool that lets you download, organize and share documents regardless of their format and structure. Knorg combines and improves the functionality found in the following types of software personal information managers, research assistants, clipboard watchers, bookmark organizers, content taggers, full text search engines, offline browsers, peer-to-peer clients. It is an ideal tool for professional researchers and journalists, software developers that work alone or in teams, students, teachers, lawyers, doctors, hobbyists. What's best, using it doesn't require hours of training since it features familiar, Outlook-style user interface and modules that are clean, intuitive and easy-to-use.