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CodeHunt – C#, Java
Pex for Fun – C#, Visual Basic, F#
Codility – C, C#, C++, Java, JavaScript, Lua, Objective-C, PHP, Pascal, Perl, Python, Ruby, Scala, VB.NET
CodeFights – JavaScript, Python, Java

Courses

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Scratch Drag and Drop programming (to understand programing logic)
CodeSchool Free/Paid AngularJS, SASS, RAILS, jQuery, JavaScript, Objective-C..
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Code.org Free Programming thinking