Below is a list of high-quality sites for programming exercises. This is not a comprehensive list since there are countless sites dedicated to coding exercises.

Nevertheless, these 12 sites alone could keep you busy for quite a while.

1. Project Euler
2. HackerRank
3. Reddit /r/dailyprogrammer
4. LeetCode
5. Top Coder
6. Code Forces
7. CodeChef
8. Programmr
9. CoderByte
10. Timus
11. HackerEarth
12. CodinGame

Three honorable mentions

These three are not full-blown automated judge sites or competitive sites, but they are certainly worth mentioning as valuable resources for problem and project ideas.

1. karan’s Projects
2. CodeKata
3. 99 problems

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The common theme amongst those who didn’t love it however, was that Project Euler is too math-focused and not very real-world oriented (unless you mostly do math research). Commenters on various social sites also recommended alternative challenges/exercises/katas sites for programmers.

As such I decided to compile a list from those that were suggested:

1. Code Wars
2. Hacker Rank
3. Top Coder
4. Reddit Daily Programmer
5. 99 [Prolog | LISP | Haskell | Perl | OCaml] Problems
6. Rosalind
7. Exercism
8. CodeKata
9. RubyQuiz
10. 4Clojure

There you have it. This list is by no means exhaustive and it should be noted, as suggested by someone else in the comments on my previous post, working on your own problems is also a great approach. Nevertheless, these sites should inspire you and keep you busy for a long time if you are up for a fun challenge.

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