NOT ON THE LIST IN 2019

A geometry package providing for both graphical and algebraic input.

Website: geogebra.org
Cost: Free. Open source
Availability: Online

Past Overall Rankings
2018: –   2017: –      2016: –    2015: –    2014: –    2013: –
2012: –   2011: 50    2010: –   2009: –     2008: –    2007: –