OpenGov is described as 'Financial Transparency and Business Intelligence Software'. There are three alternatives to OpenGov, not only websites but also apps for Self-Hosted solutions. The best alternative is OpenReporting, which is free. Other great sites and apps similar to OpenGov are Socrata Financial Transparency Suite (Paid) and Frank (Paid).
Socrata’s Financial Transparency Suite™ provides citizens and government with a detailed view of how public money flows from budget planning through the development, implementation, and management phases.
Treat backers of your nonprofit or crowdfunded project like family, and show them how each dollar is spent. Frank processes the data of every transaction made through your organization’s bank account and automatically analyzes this data in real time.