There are dozens & dozens of really really good html/svg animation products that give Flash like capabilities. But there's vastly less interest in this stuff today. Fun/simple/quirky Flash-like stuff isn't nearly as unique or novel, now that we have much more upscale products & experiences. It was a magical time & Flash helped, but we've changed & these rose-colored glasses views on Flash never point out all the myriad of ways it was awful, choppy, poorly integrated, quirky to work with, & otherwise difficult.
If you want higher there are hundreds of web-dev targeting game dev systems which can be put to use. Many of these actually do have popularity. In spite of their being good Flash-ish animation toolkits, it doesn't feel like there's a ton of demand or clear winners. It's hard to imagine what we'd want it for today.