Scwrl4 4.0 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. This free program is an intellectual property of Roland Dunbrack. 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 software is included in Education Tools.
From the developer:
SCWRL4 is a program for predicting side-chain conformations for a given protein backbone.
It runs as a console or command-line application and is parameterized with a configuration file.
Data is transferred within files which are specified via command-line arguments.
You may want to check out more software, such as Panel, Avantage BPM Foundation or Adding Machine, which might be related to Scwrl4.