HackerRank
Real Dev
Daily Coding Problem
CodinGame
Frontloops
Codewars
Code Racer
No nonsense, real world programming challenges

CodeCanyon
Codester
Theme Forest
Kodemart
CodeHost
CodeBuy.org
TemplateMonster
PieceX is a new platform available for buying and selling source code. All Engineers, From beginner programmers to senior engineers can use the PieceX. It provides source code in many languages including Java, C#, PHP ....

Which is more popular?
Based on our record, hackattic seems to be more popular. It has been mentioned 3 times since March 2021.
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What each product offers, as listed by its team.

Possible disadvantages
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How often each product is chosen within a category, 0–100% relative to the other.

Share your experience with using hackattic and PieceX. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.

I am aware of few of the resources which I've listed down below, will appreciate if you guys can share bit more. - https://hackattic.com/ : Interesting programming Problems. - Source: Hacker News / over 3 years ago
Also check out https://hackattic.com/ it has some really fun problems. - Source: Hacker News / over 4 years ago
What sort of programming would you like to do? Any real world challenges you are looking to solve? For practice “challenges” I really like https://hackattic.com/. Source: over 5 years ago
Tracking PieceX since Mar 2021.
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