Macabacus 8.6.5 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The software lies within Office Tools, more precisely Document management. 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 software is an intellectual property of Macabacus, LLC.
From the developer:
Macabacus is a set of productivity add-ins for Excel, PowerPoint, and Word. It helps you reduce mistakes with auditing tools; you can easily navigate a formula's inputs across worksheets and workbooks, using only the keyboard. This application lets you analyze complex formulas piece-by-piece to see what a portion of the formula contributes to the overall result.
You may want to check out more software, such as RJ HexEdit, Rapidocs Classic+ or Help Generator for Microsoft Access Add-in, which might be similar to Macabacus.