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This is an online risk manager, where you register all know risks in your project, assign probabilities and impacts, and then create mitigation and avoidance plans for them. Using this information the system generates an agenda of the most critical tasks for you.

Read this blog post before you start using it: 0rsk.com: Cause + Risk + Effect

You may also want to watch this video first.

Also, check this curated list of causes, risks, and effects.