RaiDrive

Great app, works pretty much exactly like NetDrive, but is free, as long as you don't need to map more than 8 drives (limited to 8 per install).

Free for personal use. Support Google Photos. Clean user interface.

Could be a perfect, but mostly useless.
Once you set-up this app, you obtain an excellent access to all your cloud storages.
Once you reboot or halt, this app puts you into shock: it demands to relogin on all clouds. For all your 3 google drives it opens 3 web-pages at once, so you will never guess which web-page is required for which app connection.
You should kill the app, start it over, and activate drives manually one-by-one slowly to avoid confusion of authorizations.
It renders app as useless in the perspective. You can use it only once today. Tomorrow you should reconfigure it again and again.

Ads in right-bottom corner of the screen in free version, too much read-only cloud services

Love it! Integrates so seamlessly into Windows.

I did a lot of research including the alternativeto itself. I chose this one. It has a lot of options and is free for 8 devices so it solves all my problems. You can search for another one, but you will waste time.

RaiDrive is FANTASTIC! Only one thing I wish for - a portable version. But that's probably not technologically possible.