What are some alternatives?
When comparing exercism and Halite Programming Challenge, you can also consider the following products
Hackr.io - There are tons of online programming courses and tutorials, but it's never easy to find the best one. Try Hackr.io to find the best online courses submitted & voted by the programming community.
Codewars - Achieve code mastery through challenge.
Geocities Site Builder - Share your abomination with the world
CodinGame - CodinGame provides users with a fun and effective way to learn coding that eschews the rigid structure of traditional teaching methods.
Codecademy - Learn the technical skills you need for the job you want. As leaders in online education and learning to code, we’ve taught over 45 million people using a tested curriculum and an interactive learning environment.
LeetCode - Practice and level up your development skills and prepare for technical interviews.