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Xcas 1.9.0, published by the Xcas project, is a free computer algebra system (CAS) built for Windows that delivers symbolic mathematics, interactive graphics, and algorithmic programming within a single lightweight environment. Acting as a graphical front-end to the Giac engine, the software supports exact and approximate arithmetic, polynomial factorization, equation solving, linear-algebra operations, and calculus, while simultaneously offering 2-D and 3-D plotting, dynamic geometry constructions, spreadsheet calculations, and statistical analyses. Educators use it to visualize functions and geometric theorems in real time, researchers rely on its scripting language for rapid prototyping of mathematical algorithms, and students benefit from immediate feedback when exploring algebraic or geometric concepts. The interface is drawn with the fast, cross-platform FLTK library, ensuring responsive rendering even on modest hardware; users who prefer a Qt-based look can switch to the companion qcas build without sacrificing any core functionality. Version 1.9.0 refines plotting speed, extends the statistics module, and tightens compatibility with recent Windows releases, while the earlier 1.8.x branch remains available for legacy systems. Because the entire toolchain is open-source, advanced users can embed Giac scripts in external programs or extend the CAS with custom modules, making Xcas equally suitable for quick classroom demonstrations and for building specialized mathematical applications. The software is available for free on get.nero.com, with downloads provided via trusted Windows package sources (e.g. winget), always delivering the latest version, and supporting batch installation of multiple applications.
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