Our website provided a free download of DEVONthink 3.9.8 for Mac. This Mac application is an intellectual property of DEVONtechnologies, LLC. The application lies within Productivity Tools, more precisely Timekeeping.
From the developer:
Information overload — Swamped by paper, emails, notes? Meet DEVONthink — designed to manage and organize all those disparate pieces of information that are so important to your work or studies. As you become more experienced with DEVONthink and its easy, intuitive interface, you will quickly find more exciting ways of using your data.
You may want to check out more Mac applications, such as Ammonite, DEVONagent Pro or EasyFind, which might be similar to DEVONthink.