Hi Ruebenn,
you can try the software QMSys Uncertainty Workshop.
The Uncertainty Workshop uses two different methods to calculate the measurement uncertainty: the uncertainty propagation (GUM), which has been described extensively in the GUM framework and the Monte-Carlo method, which has been detailed in the first GUM-supplement. Software is compliant with ISO/IEC/EN/DIN 17025 - 2005, ANSI/NCSL Z540.3-2006.
The software is available as a free trial for 14 days or 30 uses. Upon expiration of the trial period, the user can open the software in demonstration mode only.
Regards,
Stefan