Here are two great examples of how cities are using ArcGIS to power open data sites.
The first one is from Arlington, TX and allows the public to interactively explore the city's performance management dashboards to see how they are doing in relation to their key performance indicators (KPIs).
The second one is from Topeka, KS and allows the public to interactively explore the city's budget using ArcGIS Insights. You can choose between the Operating Budget, Capital Budget, or Projected Budget Revenues. Just click any of the three EXPLORE buttons.
These are innovative examples of public engagement and transparency applications powered by ArcGIS. Let them inspire you to be more innovative.