Flow is a font family built for abstracting content and code for design mockups, wireframing, presentations, and websites. It's not perfect, but neither are your wireframes. Flow has sub-pixels, artifacts, overlaps and other imperfections.
Flow comes in three styles: Circular, Rounded and Block.
Check out danross.co/flow/.
To contribute, see github.com/HYPD/flow-typeface.
To learn more, read Flow and Redacted: Check out these new options for wireframes and other early-stage designs.
Flow Rounded is licensed under the SIL Open Font License 1.1. You can use it for free in personal and commercial projects: logos, websites, apps, videos, print and products. You may embed it and modify it; the font files themselves may not be sold on their own.
To use it on a website, add the files with @font-face and set font-family: 'Flow Rounded', sans-serif;
View the full license text (also included in the ZIP).