Apollonius is described as 'Dynamic geometry software for iPhone' and is an app in the education & reference category. There are six alternatives to Apollonius for a variety of platforms, including Windows, Mac, Linux, Web-based and Android apps. The best Apollonius alternative is GeoGebra, which is free. Other great apps like Apollonius are GeoGebra CAS Calculator, Winplot, The Geometer's Sketchpad and Lybniz.
GeoGebra is free and multi-platform dynamic mathematics software for learning and teaching. It has received several educational software awards in Europe and the USA.
Free online algebra calculator from GeoGebra: solve equations, expand and factor expressions, find derivatives and integrals
"Winplot is a free graphing utility that was written by Richard Parris, a math instructor at Phillips Exeter Academy in Exeter, New Hampshire. Sadly Richard passed away in 2012. After Richard's death the program was still available for a number of years on the Exeter...
Sketchpad® Dynamic Geometry® software gives students a tangible, visual way to learn mathematics that increases their engagement, understanding, and achievement. And it's not just for geometry.
Lybniz is a simple and very easy to use mathematical function graph plotter written in Python and GTK. Expressions are entered in Python syntax.
KSEG is a free interactive geometry program for exploring Euclidean geometry. It runs on Unix-based platforms (according to users, it also compiles and runs on Mac OS X and should run on anything that Qt supports).
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