CodePen vs CotEditor: What are the differences?
What is CotEditor? Open Source Plain-Text Editor for OS X. CotEditor is a lightweight plain-text editor for OS X.
CodePen belongs to "Cloud IDE" category of the tech stack, while CotEditor can be primarily classified under "Text Editor".
CotEditor is an open source tool with 2.8K GitHub stars and 251 GitHub forks. Here's a link to CotEditor's open source repository on GitHub.