I use DEVONthink Pro Office from www.devontechnologies.com to collect, tag and organize snapshots of web pages (either as webarchive, pdf or instapaperized pdfs), referenced OmniOutliner documents containing more complex notes, ocr'ed screenshots and other research stuff. It is more a conventional or even traditional app than a cloud based service. Imported that .enex file when I left Evernote.