I have a Windows 10 PC, another PC with Windows 7, a MacBook Pro with OSX 10.11 and an Android phone - they are all connected to the same home wifi network.
I want to be able to transfer files between them all wirelessly, in a simple, fast and free manner.
I could use some cloud storage service (e.g., Drive or DropBox), which would be ok, but I'd like direct transfer, rather than having to store my files in the cloud...
To share files between the two Windows PCs only, I use the Home Group functionality, and I wanted something like that, but allowing sharing with OSX as well (and optionally with Android, although that's not required).
Which would be my best option?