I'm proud to present WSM 4.1. This version improves connectivity with other tools and adds features in system reliability and usability, as well as many quality improvements.

• Support for FMI import of models from other tools
• Reliability analysis of system models using reliability diagrams, fault trees, and parametric lifetime distributions
• Improved unit support that enables input and plotting in user-chosen units
• Complete copy and paste support among models
• Better native look and feel on OS X
• Improved search and navigation in documentation
• Fully updated Modelica by Example book on the Modelica language

Learn more on what's new here.

There's also a blog featuring reliability analysis.

Enjoy!