3rdRisk is described as 'Complete solution for Vendor Risk Management' and is a Privacy Tool in the category. There are four alternatives to 3rdRisk for Online / Web-based and SaaS. The best alternative is OneTrust. It's not free, so if you're looking for a free alternative, you could try WeControl. Other great apps like 3rdRisk are Vendict (Paid) and Enactia (Paid).
Enactia is a comprehensive cloud software suite for Privacy and Cybersecurity Compliance management. Enactia offers compliance assurance driven by software and allows working with templates, predefined workflows and external vendors.