Zotero
Zotero is open source software for academic research. It is primarily aimed at professionals and students. But anyone who has to do research will find the program handy. Zotero gathers your materials in one place which you can then search and edit. The software is developed by the Roy Rosenzweig Center for History and New Media.
The software allows you to add webpage snapshots, videos, images, audio files, PDFs and other files.