Retrodesmos:
Desmos Activities based on Classic Video Games that are rewritten to amplify mathematical learning!
Khan Academy:
Free reteach and practice problem generator for all topics covered in mathematics courses.
https://www.khanacademy.org/search?page_search_query=pre%20algebra
Mandlebrot Painter Activity:
Students will be able to trace and map the paths of different iterations of the mandelbrot set and visualize which subset equations make each Julia Set Pattern.
https://www.geogebra.org/m/XQprvGbW
Fibonacci Sunflower Applet:
Students can use an applet to test and visualize the most efficient way nature packs seeds into plants and the math involved in this mesmerizing process.
https://www.mathsisfun.com/numbers/nature-golden-ratio-fibonacci.html