Sources of free and commercial ArcView 3x extensions. Extensions are add-on utilities that increase the functionality of this older (and unsupported) version of Esri’s desktop GIS application.
Columbia Mapping Extensions
Keith Massie’s site for select ArcView extensions for downloading.
Coulter Mapping Solutions
Select extensions available for downloading after online purchase.
Cyze & Associates
Download free Natural Neighbor extensions.
Descriptions of free extensions available from Quantdec.
Free stand alone utility for determining the associations of shapefiles and ArcView GIS projects.
Online commercial site with a vast collection of ArcView extensions to help with project management and data analysis.
Download the famous Xtools extension which is a must have if you want to accomplish some of the common ArcInfo functions in ArcView.
ZEBRIS Free Extensions
Free ArcView extensions that you can download from this site. Click on the ArcView Extensions link to load the download page into the frame.