Federalist is an open source web publishing platform for the United States federal government. It provides templates for websites, an online editor for maintaining content, and cloud-based infrastructure for high-scale, low-cost website hosting.
The team at 18F builds and maintains it as a hosted service available to federal government agencies.
Using a site like this, you can host a landing page for a report, information about a new program, or ways the public can get in touch.