Publish government data as datasets for download.
Software developers can build applications using the data (e.g. visualizations, reports, etc.) without the government having to spend money on software development or having to spend money to host applications.
This is being done at the federal level.
Example: Detailed imports and exports data for Washington State
Example: Trip planner (county example because it easily illustrates the reason)
For example, Google maps allows you to schedule public transit trips including doing so on your mobile phone.
By making the trip planner data available as a download, Google and other companies can provide the website and service to plan trips on public transportation.