Qiqqa is award-winning research management software, designed for commercial and academic researchers.

Citavi is a reference management program.

Paperpile is a web-based reference management software, with special emphasis on integration with Google Docs and Google Scholar.

Mendeley is a free reference manager and an academic social network.

OmniOutliner is a commercial outlining software for Mac OS X.

colwiz (collective wizdom) is free web, desktop and mobile based research management software.