Desmos
Desmos is a powerful, free graphing calculator that helps students visualize algebraic concepts. It also offers activities and challenges designed to help middle school students improve their math skills in a fun and interactive way.
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Fluency by Heart
Fluency by Heart focuses on developing math fluency through engaging, interactive games and activities. The resource is designed to help students build a strong foundation in basic math facts, improving both speed and accuracy in solving problems.
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Mister WooTube (Eddie Woo)

https://misterwootube.com/2020/03/18/lesson-videos/#S4

Mister WooTube is the educational platform of Eddie Woo, an Australian mathematics educator known for his engaging teaching style. He records and shares his classroom lessons online, covering topics from basic arithmetic to advanced mathematics. The lessons are organized by year level and topic, providing a comprehensive resource for students seeking to reinforce their understanding of various mathematical concepts.

Math Antics

https://www.mathantics.com/

Math Antics is a website offering a series of animated video lessons designed to make fundamental math concepts more accessible and enjoyable. Created by Rob and Jeremy, the videos cover topics such as fractions, decimals, percentages, and basic algebra. The content is organized by topic rather than grade level, making it suitable for students from 3rd to 8th grade, as well as older students seeking a refresher. While some advanced features require a paid subscription, the videos are free to watch!