Run each of these in a separate terminal instance so that all sites can be run concurrently:
- Navigate to 
angular-exampledirectory and executeng serve. - Navigate to 
react-exampledirectory and executenpm start. - Navigate to 
vue-exampledirectory and executenpm run serve. - Navigate to 
aspnetcore-exampledirectory and executedotnet run. - Open browser and serve up the 
index.htmlpage. 
This should show you a row of tabs, each with an icon indicating the site being served. Clicking on the tab will show that particular site being rendered in the space directly below the row of tabs.
You can also checkout the JS Bin here, although, it will still require that the various sites above be started.