Downloading Cadig AutoField for AutoCAD x64 5.8 from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this software available. Cadig AutoField for AutoCAD x64 relates to Office Tools. We recommend checking the downloaded files with any free antivirus. The following version: 5.8 is the most frequently downloaded one by the program users. The actual developer of the software is Cadig Inc.
From the developer:
AutoCAD Field can be inserted in any kind of text (except tolerances) in AutoCAD and AutoCAD LT, including text in table cells, attributes, and attribute definitions. AutoField adds many efficient fields to AutoCAD and AutoCAD LT. You can import the cells of Excel spreadsheet as fields or attributes. And you can use a field to count blocks (including AutoCAD dynamic blocks) or calculate the area and length of multiple objects.
You may want to check out more software, such as Cadig TableBar for AutoCAD 2005, Cadig AutoTable for AutoCAD 2007 or InnerSoft CAD Demo for AutoCAD 2011, which might be similar to Cadig AutoField for AutoCAD x64.