Which open source web based IDEs exists

I don't want to start a debate, which I know is not "fit for the Q&A format of StackOverflow". However, I would like to have a complete list of web based IDEs, with their main feature sets. The reasons for my question, is because I have created one myself, and I would want to create a feature comparison, in addition to find inspirations for new features I could incorporate into my own IDE.

They don't necessary have to be Open Source, as long as I can either test them myself, or at the very least see their features somewhere.

Sorry if my question is bad, but I am new to this forum as a poster, even though I've read probably thousands of Q&As here over the years ...