Is there a mechanism to embed code editors(Python, Java, Javascript) within a cloud based application.
What are some of the best open source option ?

Yes to the first question (forgot the ? mark.)

I'd start with a search like https://www.google.com/search?&q=open+source+code+editor+cloud but I can't see how anyone can determine best except you since you didn't write how to score these systems. For example your cloud could be AWS, some Google Cloud or a Cloud you run on Linux. Also you may have some need for a full up IDE with compiler backend which I use at times to try to answer questions here.

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