I am developing a project risk assessment model for energy projects in my country. Which free (or cheaper) web based software can help me do this more so that i expect more than 15 experts to participate in virtually scoring the risks based on probability and impact of each risk factor. The software must accommodate expert scores which must be automatically collated.

The output must enable me to see which risk factors are more riskier and then do some further quantitative risk analysis to develop weights for each risk factor which can be used on a case study?