This is a unique, technically sophisticated package for geometry which can be used to learn Euclidean, projective, spherical, and hyperbolic geometry; conduct exacting geometric research on automated theorem proving; and serve as an authoring tool for designing web pages with interactive geometric constructions. It is distinguished from its competition by the use of the most elegant algorithms as well as its Java based code that allows it to run on Windows, Unix, Linux, or Mac. Cinderellas visualization capabilities also allow users to view and manipulate geometric constructions in different planes simultaneously.
From the reviews: "Cinderella: the interactive geometry software . Springer, 2000. $54.95. CD-ROM 1 disc; user manual of 150p. Cinderella is a gem: this interactive geometry package offers an environment in which the user can do classic or original constructions with extreme accuracy and ease. Interactive exercises may be created and exported as Web pages, which include necessary Cinderella tools. Hints can be displayed after a specified time interval, and built-in automatic proving capability allows for an immediate check of student solutions. Drawings created are extremely accurate and can be exported as PostScript files. The authors explain, albeit in a sketchy fashion, what goes on behind the scenes in Cinderella constructions; for example, the models are based on Caley-Klein geometries. Cinderella allows constructions in Euclidean, hyperbolic, elliptic, and projective geometry. The fact that Cinderella is written entirely in JAVA allows for a high level of portability. The ease of both construction and exporting applets is amazing. Necessary run-time packages are provided and may be included when users post their constructions and exercises, as long as the use is not for profit. This package far outstrips its competitors (such as The Geometers Sketchpad, Cabrigeometry II) in capability and ease of use. The cost of this package is remarkably low, given its capabilities. A downloadable demo may be found from the publisher (http://www.cinderella.de/) where one will also find a wealth of online documentation, examples, and support. Highly recommended for all teachers and students of geometry from high school through undergraduate level." -- R. L. Pour, Emory and Henry College - CHOICE magazine, Febr. 2001