Downloading ET GeoTools Concurrent for ArcGIS 11.3 from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this software available. The program is categorized as Photo & Graphics Tools. We recommend checking the downloaded files with any free antivirus. The most popular versions among the software users are 11.3, 10.2 and 10.1. This software was originally created by ET SpatialTechniques.
From the developer:
ET GeoTools Concurrent for ArcGIS can increase the editing productivity in ArcMap, give enhanced editing functionality to the ArcView users and enable them to create and maintain topologically correct datasets. The tools are designed mainly for users with ArcView license, but will be asset for ArcEditor & ArcInfo license holders as well.
You may want to check out more software, such as ET GeoTools for ArcGIS, ArcGIS for AutoCAD 300 or ArcGIS Editor for OpenStreetMap, which might be similar to ET GeoTools Concurrent for ArcGIS.