BadgesSharp is a free service to generate badges that need some kind of input and processing before you can display them on GitHub repositories: https://badgessharp.apphb.com
Take a look on our Getting Started guide and a get your badge generated in a few steps.
How to improve it?
Create a fork of BadgesSharp.
Did you change it? Submit a pull request.
Licensed under the The MIT License (MIT). In others words, you can use this library for developement any kind of software: open source, commercial, proprietary and alien.