On the 22nd of June 1998, the KDE Free Qt Foundation was founded and has accompanied Qt on its amazing journey to become the success story that it is today. Qt has established itself as the go-to solution for UI development because of its high quality, consistency, ease of use, and broad cross-platform support. A key factor in this achievement is Qt's dual licensing strategy: Qt is available as free software for open source, but it is also available under a paid license for proprietary software development.