DeclaraCAD is described as 'A declarative parametric 3D modeling application built using Open Cascade (pythonocc) and enaml (python). It's similar to OpenSCAD in that everything is intended to be defined programatically' and is a CAD Software in the Photos & Graphics category. There are more than 10 alternatives to DeclaraCAD for a variety of platforms, including Linux, Mac, Windows, Self-Hosted solutions and Online / Web-based. The best alternative is OpenSCAD, which is both free and Open Source. Other great apps like DeclaraCAD are CadQuery (Free, Open Source), Antimony (Free, Open Source), OpenJSCAD.org (Free, Open Source) and ImplicitCAD (Free, Open Source).
OpenJSCAD.org is a more up-to-date OpenJsCAD frontend where you can edit .jscad files either locally or online via JS editor (built-in). A few functions are available to make the transition from OpenSCAD to OpenJSCAD easier (OpenSCAD.
ImplicitCAD is a programmatic CAD program, implemented in Haskell. Unlike traditional CAD programs, programmatic CAD programs use text descriptions of objects, as in programming. Concepts like variables, control structures and abstraction are used, just as in programming.