I had a quick question regarding discourse themes, is it allowed to sell theme created on discourse on 3rd party sites such themeforest etc?
I am unable to find such information and that is why I wanted to know this.
I don’t see why this should be a problem (assuming, obviously, that you have the copyright for the theme you’re selling).
While Discourse is GPL-licensed which requires derivative works to also be GPL-licensed, I’d say that considering a theme to be a derivative work is pretty far-fetched – most likely, you’re only shipping CSS code and your own assets anyway.
If you want to be 100 % safe, wait for a reply from someone from Civilized Discourse Construction Kit, Inc. on this subject.
I different case could probably be made if your theme included significant portions of (modified) Discourse source code, e.g. handlebars templates.
Glad to know this, I also don’t know if Themeforest or other websites allow selling discourse theme.