From what I recall there were quite a few, most of them discontinued: https://en.wikipedia.org/wiki/Adobe_Wallaby https://en.wikipedia.org/wiki/Adobe_Wallaby ht

From what I recall there were quite a few, most of them discontinued: https://en.wikipedia.org/wiki/Adobe_Wallaby https://en.wikipedia.org/wiki/Adobe_Wallaby https://en.wikipedia.org/wiki/Shumway_(software) https://en.wikipedia.org/wiki/Shumway_(software) https://en.wikipedia.org/wiki/Google_Swiffy https://en.wikipedia.org/wiki/Google_Swiffy There's also https://github.com/tobytailor/gordon/wiki https://github.com/tobytailor/gordon/wiki I guess most of them are more or less dead :-/