I have tried - and so far been quite happy with - Joplin as my Evernote replacement. The free version doesn't sync directly between devices, but if one has another storage medium such as Dropbox, the devices can all
sync trough that.
It also allows an import of the
exported Evernote data.
I am still getting used to the PC desktop app interface that has a "developer" look to the note next to the polished version, but I am getting there.
I have not tried the iPhone app, but the Android one at least is working fine.