Free tool for Windows for Housing Zettelkasten
Back in the days of Windows 3.1 was a great piece of software called Tornado Notes (Later renamed Info Select). It used the analogy of a stack of cards, and kept each stack in a plain text file that was immediately searchable. Its' price (Currently $280) became a serious impediment.
Luckily, there is a freeware alternative available. InfoBase is available at http://freeware.persoft.ch/program_en.htm . The download is less than 4 MB. I use it for all of my notes. It can live on a USB drive as a portable program.
It's certainly worth a try. I'm not an agent of Persoft, just a happy user.
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