The VCL style is the so called “Dark Theme” of RAD Studio DX10.2 Tokyo update 2 which comes from DelphiStyles.com

FireMonkey implementation for Linux
Start build UI Linux apps with Embarcadero Delphi and FmxLinux

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Raudus is a web-framework and component set for Delphi and Lazarus, that allow create Rich Internet Applications (RIA). The development process is very similar to desktop applications development. Using Raudus you create both client-side and server-side at the same time. UI RAD components are shown at client, event handlers are executed at server. Raudus is well suitable for database applications.

FireMonkey implementation for Linux
Start build UI Linux apps with Embarcadero Delphi and FmxLinux

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DelphiStyles.com sells custom VCL and FireMonkey Styles. They are offering a free custom VCL Windows Style for RAD Studio 10.2 Tokyo customers through the GetIt Package Manager (Tools > GetIt Package Manager).