I'm a student from Afghanistan and I like to use Mathematica to experiment with as a hobby. But I cannot afford it. Does any one know of a free option?
You can download 15-day trial Mathematica for free with "just an e-mail address" here:
Other solutions presented in comments:
One idea would be to use Wolfram Alpha (which is free) and has many of the same capabilities as Mathematica. – bill s
Depending upon your use needs, wolfram cloud basic is free. There are also ways to have a jupyter environment running the wolfram engine that is free for developers. Here is a link. – CA Trevillian
Here's an idea: Have your teacher contact Wolfram (wolfram.com/contact-us ), and ask if they would be willing to donate one copy of Mathematica to your school, which would be installed on a school computer. Then all the students would have access to it. He should include a link to the school's website. – theorist
A cheap way to get a licensed copy of Mathematica is to purchase a Raspberry Pi computer. It's good for other educational purposes, too. – John Doty