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D Programming Language vs C3: catalog facts
D Programming Language	C3
Free Free and open source.	Free Free and open source; the compiler and standard library use LGPL-3.0 and MIT licences.
Windows, macOS, Linux, Command line	Windows, Linux, Web, Command line
Compiles to fast native code Familiar C-like syntax with modern features	Syntax close to C, with a C-to-C3 guide Optionals, generics and compile-time reflection
Smaller community and library ecosystem than C++ or Rust	Pre-1.0 language that may still change Smaller ecosystem than C or C++
Downloadable app	Downloadable app, Web application
Open source	Open source
License: BSL-1.0	License: LGPL-3.0-or-later, MIT
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.