I love Visio - particularly the pre-Microsoft versions (4.2, 4.5 IIRC), but my paid-for Visio 2007 is getting less & less supportable - it's still just OK on Win7, but it looks like it won't go on Win10.
Visio 2016 is over $1,000 retail, which is way more than I want to pay
So, what are alternatives, either free or much cheaper than Visio, and legal that can read and write ".vsd" files (at least as late as the Visio 2007 version).
Oh yes, and preferably with a UI that's not too user hostile.