There is something amusing about the fact that WinDirStat, as far as I know, was based on KDirStat (now QDirStat), yet this doesn't even get mentioned on their Wikipedia page, and by and large a lot of people don't even know QDirStat exists. One time someone even asked me if they knew of a good alternative for Linux; good news!
SpaceSniffer is an even better version of WinDirStat but I rarely see people talk about it, too.
It is actually mentioned on the Wikipedia page [1] - and of course, you could add it yourself if that's not enough.
https://en.wikipedia.org/wiki/WinDirStat#Version_history[10]
To my knowledge, SequoiaView[0] predates even KDirStat - it just didn't have the tree view paired with it.
[0] https://sequoiaview.win.tue.nl/