GeoGebra is more of an ecosystem than a program. For instance: [br][br][list][*]You can upload stuff you do to GeoGebraTube. This is a great way to distribute your stuff to students. They can then use and interact with it in their browser. This requires you to sign up for an account, something which is really simple: [url=https://accounts.geogebra.org/user/create]https://accounts.geogebra.org/user/create[/url] [br][/*][*]You can steal things from GeoGebraTube. If you see something you like but want to change a little, then download it, change it and upload it. You may want to give credit to the one you stole it from but it is considered to be OK even if you don’t. [br][/*][*]You can run GeoGebra straight from your browser. Go to [url=http://web.geogebra.org]http://web.geogebra.org[/url]  [br][/*][*]You can put many things on GeoGebraTube into GeoGebraBooks. These Books can contain constructions (yours and others), text, equations, images, video… This is in effect a simple publishing system for dynamic math.[br][/*][*]You can use GeoGebra collaboratively in GeoGebra Groups: [url=https://www.geogebra.org/b/1809555]https://www.geogebra.org/b/1809555[/url]. This is in effect a classroom management system. You may create instructions and quizzes for your students etc.  [br][/*][*]You can use GeoGebra during exams: [url=https://www.geogebra.org/blog/2016/02/geogebra-exam-mode/]https://www.geogebra.org/blog/2016/02/geogebra-exam-mode/[/url] and [url=https://www.geogebra.org/exam]https://www.geogebra.org/exam[/url] [br][/*][*]You can use GeoGebra on computers, tablets and phones: [url=https://www.geogebra.org/download]https://www.geogebra.org/download[/url] [br][/*][*]GeoGebra has its own Youtube channel: [url=https://www.youtube.com/user/GeoGebraChannel]https://www.youtube.com/user/GeoGebraChannel[/url] [/*][*]GeoGebra is on Facebook: [url=https://www.facebook.com/geogebra/]https://www.facebook.com/geogebra/[/url] [br][/*][*]GeoGebra is on Twitter: [url=https://twitter.com/geogebra]https://twitter.com/geogebra[/url] [br][/*][*]GeoGebra has very good introduction guides: [url=https://www.geogebra.org/wiki/en/Tutorials]https://www.geogebra.org/wiki/en/Tutorials[/url] [br][/*][/list][br]Apart from all this, GeoGebra still is the program where you can create every dynamic mathematical visualisation you ever dreamed about. Dynamic geometry, dynamic graphing, dynamic algebraic representations, dynamic texts, dynamic spreadsheets, dynamic 3D objects, dynamic symbolic algebra and more. GeoGebra covers all mathematics ever needed in school and part way through university and is the perfect way to introduce students to modern mathematical tools. The skills they learn from using GeoGebra can easily be translated to professional tools like Matlab or Mathematica later on. [br][br]Designed for school and built to be free for the end user, the enthusiastic developer team [url=https://www.geogebra.org/team]https://www.geogebra.org/team[/url] is commited to make GeoGebra the mathematical environment of yor choice. And if you ever run into problems, the helpful forum [url=https://www.geogebra.org/help/]https://www.geogebra.org/help/[/url] will quickly sort you out. In addition to this, there are now many countries sporting national support services through Facebook (Norway, Sweden and Denmark comes to mind)