The 1.5.5 version of SlipBox for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. SlipBox for Mac lies within Productivity Tools, more precisely Mind-mapping. According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. This free Mac app is a product of Markus Guhe.
From the developer:
A slip-box is really just a loose collection of slips stuffed into a box. Each time you have an idea that seems worth remembering you scribble down a note on an (electronic) slip, put it into the box and forget about it. Once you need your ideas, the functionality of the program helps you to quickly find relevant slips and, what is more, relations and links between different slips by associative searches.
You may want to check out more Mac applications, such as myNotes, Tinderbox or NovaMind, which might be related to SlipBox.