Can’t find anything anywhere in particle.io
The code is just text. You can copy and paste it into any text editor you have on your computer.
I feel the suggestion to copy-n-paste is unsatisfactory. Perhaps it could be done reasonably when your application is a single simple file. But for applications that involve many files, the process of going to each one in sequence, select-all, copy, open local editor, paste, save under the right file names. This is error prone and very tedious.
I’ve seen threads here discussing making a connection between the cloud IDE and GitHub or BitBucket possible. That would be wonderful if and when it is done.
Besides that, there is no practical answer.
I am with you guys, a source code download function would be great, similar to the firmware download button.
Folks, I believe the upcoming MAJOR library redesign will address this and much more.