Citavi is a Windows-based reference management system. It helps you research and render sources accessible. Furthermore it supports organizing information and tasks for your scientific papers and thesis.
Up to 100 sources may be managed free of cost using the version Citavi Free.
If this is insufficient, members of Brandenburg University can use Citavi Pro as a "campus license". You have to request a license key using your valid University-E-Mail-Address (...@th-brandenburg.de).