This CSound Player and Editor provides an easy way of editing and playing CSound(*.csd) files.
You can play and edit CSD file in your browser directly. This app provides visual audio spectrum and saving audio to WAV file.
You can choose a CSound file from your computer or from Google Drive.
It has a very straight forward user interface that can get you started in seconds.
This app only works locally without going through the server. You can play, listen, and edit a CSound file instantly real-time on your browser.
It's absolutely free for those who want to play/edit your CSound code. 

Csound is a user-programmable software sound synthesizer of great power. Users write instrument definitions in Csound's orchestra language to render notes written in Csound's score language, played on a MIDI controller, or by some other programming language.