WhizCoder is online IDE with compiler, interpreter and debugger. Supported programming languages are Java and Python. Available debuggers are JDB for Java and PDB for Python. Code and Debug on WhizCoder and unlish great coder within you.
W. Zhang, P. Larsen, S. Brunthaler, and M. Franz. Proceedings of the 2014 ACM International Conference on Object Oriented Programming Systems Languages &\#38; Applications, page 727--743. ACM, (2014)