Build VCL application for macOS and Linux without modifications of sources. Using CrossVcl you focus only on your VCL application and CrossVcl makes it cross-platform.
Full featured FireMonkey implementation for Linux platform. Using FmxLinux you focus only on your FMX application and FMXLinux makes it available on Linux.
Build native iOS/macOS/Android application using Delphi. Design in Xcode or Android Studio. Code in Delphi. Build with TurboCocoa.