CBFS Developer Subscription (formerly CBFS Professional Developer Subscription) includes access to all of Callback Technologies' developer libraries. This includes components for virtual file systems, access control and monitoring, Windows File Explorer customization, file synchronization, and more. It also includes editions for every Desktop, Mobile, and Server platform, covering .NET Framework, .NET, C++, Java, Delphi, macOS, iOS, Android, Qt, Go, Rust, and more. Additionally, the subscription provides free upgrades and updates, ensuring developers always have access to the latest versions of the software.