Bibliographix is a pay what you want publication manager. The idea manager helps you writing down ideas and finding them later. The reference manager supports you in fitting the currrent state of research into your manuscripts.
The application runs under Windows, MacOS and Linux. You may (if you prefer to) setup the application in your Dropbox/Google Drive/... account and access it from anywhere.
Find a feature list here and Screenshots here.
You can download it here