[klyrs]

Sorry, Unity was the first that came to mind, I forgot it was closed. Good call.

Though, I should clarify... the missed opportunity with Flash is that there was no good reason for the .swf format to be closed. IIRC, there were a few attempts made at making non-Adobe Flash players, but they were always terrible because of the necessary overhead of reversing the format.

Even if the initial version was built on Unity, as long as the creations were saved to an open and well-documented file format, alternative players could be written which would be a boon to the ecosystem.

[Shared404]

That seems reasonable.

Honestly, I think open formats and protocols are more important in general than open code -- which is of course why we see them less and less these days :( .