WPF Toolkit 3.5.50211.1 could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this software available.
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. The most popular version among the software users is 3.5. This free software is a product of Microsoft. The program's installer is commonly called client.exe or VDownloader.exe etc. The program lies within Development Tools, more precisely IDE.
From the developer:
The WPF Toolkit is a collection of WPF features and components that are being made available outside of the normal .NET Framework ship cycle. The WPF Toolkit not only allows users to get new functionality more quickly, but allows an efficient means for giving feedback to the product team. Many of the features will be released with full source code as well.
You may want to check out more software, such as Xceed Extended WPF Toolkit Plus, Popup Toolkit or SD-TOOLKIT® Barcode Reader SDK, which might be related to WPF Toolkit.