if u know the answer then why did u come and ask lol. Ur not gonna find many cross platform anything. And U can edit wavs in PT to be honest thats the only use Id really have for it or tracking perhaps but hey to each his own enjoy ur search
There are many cross platform music aps that run on win and mac. In fact, all my apps except my wave editor and a few vsts are cross plat. Which is why i was tring to get a list of cross plat wave editors.
Pro tools has some wave editing capabilities, but is not a full fledged wave editor.