Apps similar to Apollonius include GeoGebra, which is free. Other options are GeoGebra Discovery, GeoGebra CAS Calculator, Winplot and The Geometer's Sketchpad. In total there are seven Calculators like Apollonius for Windows, Mac, Linux, the web and Android.
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.
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GeoGebra Discovery is an experimental version of GeoGebra. It contains some bleeding edge features of GeoGebra that are under heavy development and therefore not intended for every day use yet, so they are not included in the official GeoGebra version.
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Free online algebra calculator from GeoGebra: solve equations, expand and factor expressions, find derivatives and integrals
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"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).
