Pyramid is the most flexible of the three. It can be used for small apps as we’ve seen here, but it also powers big-name sites like Dropbox. Open Source communities like Fedora choose it for applications like their community badges system, which receives information about events from many of the project’s tools to award achievement-style badges to users. One of the most common complaints about Pyramid is that it presents so many options it can be intimidating to start a new project.