Codewars
Achieve code mastery through challenge.
16 Alternatives To Codewars
CodeSignal
CodeSignal is the leading assessment platform for technical hiring.
Coderbyte
Coderbyte is a place built for anyone to practice and perfect their programming skills.
Coursera
Build skills with courses, certificates, and degrees online from world-class universities and companies
Devskiller
Review of DevSKiller Software: system overview, features, price and cost information. Get free demos and compare to similar programs.
Free Code Camp
Learn to code by helping nonprofits.
Geektastic
Geektastic is a platform that manages peer reviewed code challenges supported by a community of qualified software engineers.
Geocities Site Builder
Share your abomination with the world
Hackerearth
HackerEarth is the network of top developers across the world. They connect to start-ups, tech companies, organizations and discover the best developer jobs. They participate in programming challenges and compete against other top developers.
LeetCode
Practice and level up your development skills and prepare for technical interviews.
Project Euler
Project Euler is a series of challenging mathematical/computer programming problems that will…
Robocode
Robocode is a programming game where the goal is to code a robot battle tank to compete against…
Topcoder
The Topcoder home page has received a slick new makeover that lets new customers quckly login, discover the power of our community, and launch challenges.
Treehouse
Build an App. This is the spot to learn how to build apps. You’ll learn the language, tools, and necessary concepts to get your app out the door. Get Started · Feature business .
Udacity
Join Udacity to learn the latest in Deep Learning, Machine Learning, Web Development & more, with Nanodegree programs & free online courses.
Udemy
Online Courses - Learn Anything, On Your Schedule
exercism
Download and solve practice problems in over 30 different languages.