Speaking of Rivals, go google gdevelop.
gdevelop tried doing the web thing years before c3 was announced, and even offered it free.. Nobody is using it, as many of the native version features are missing <img src="{SMILIES_PATH}/icon_lol.gif" alt=":lol:" title="Laughing">
https://gdevapp.com/
ironically the link to that seems to be dead atm
everyone still uses the native editor - as that is multiplatform anyways
http://compilgames.net/
Gdevelop is made by a french guy called Florian Rival and another guy called Victor - as a free open source project.
I think they do it in their free time, because the engine is still somewhat buggy and rough around the edges when compared to construct2.
An interesting development there is that recently they started using cocos2d under it's hood and made it an export option over pixi. Now the engine can export to native android, html5, native mac,ios, windows and linux ..
Florian is too busy with the successful kickstarter game he is making with it atm, so updates have been scarce
https://www.kickstarter.com/projects/ia ... e-video-ga