The service rotates around features available (read the article) plus support. Do you expect free support if you are a company? Do you expect them to provide everything for free?

The company I work for recently tried NoMachine. I know it's not a sync solution, it's mainly for remote access, but you can file share easily between server and client and vice-versa making it a useful way to store important stuff where you want it, ie. not on someone else's cloud. Nomachine integrates with AD as well.

Do they offer an app for Android?

This will be the year that organizations will be looking for a "single pane of glass" with which to monitor and manage their hybrid environments. Who can offer that?

Why is everyone insisting on open source software?! Did they guy ask for advice on what was open or not? Quoting "Can you recommend any tools that can achieve the goal of remote individual application access across platforms for free or at low-cost?" It doesn't matter if NoMachine's v 4 is closed source. What counts is that it WORKS! And who said NX 3.5.0 is not maintained any more? What nonsense!!!! As a long-term customer of NoMachine's v3.5.0 eagerly awaiting v 4 to come out of Preview, I can assure everyone that this is not the case.