Multiplicity is from Stardocks (or from their branch-off Edge..., Ever.... Whatever), which obviously is the contrary of a one-man software software house, but which sells, besides lots of games, a lot of crap, their "Fences" being some quite prominent but particularly useless (and ugly) little tool for example. For non-big-corporations, Multiplicity comes in 3 flavors: 20$ for a KM for just 2 comps, and then 40$ / 100$ (always plus VAT) for up to 9 comps, but as a KVM, the 40$ versions handling the monitors of 2 of them though.
-ital2
I'd disagree quite heavily with you here. First of all, Stardock is not a one man shop. It's been around a while, and has been very prolific, especially in the customization community, with well done software.
The games came after, not before, and Edgerunner was their attempt to put the business software under a different name.
I extensively use Multiplicity, and have found none of what you said to be true. My primary computer has no load while I'm on my secondary computer, and I did check this while trying to run something down that was totally unrelated. It's been a lifesaver at home and work, and very much easier for me to set up than Synergy or Sharemouse. It just works. Your other complaint about it- the lack of indication and how it's done- I can't really speak to, as I know when I'm on a different monitor, so it's never been an issue. As you have to move the mouse, it seems that it's not something that you'd need an indication of, and I haven't found the need in practice.
Fences contrary to what you said for me, is a very useful software, and I don't think that I'm the only one that thinks so. It was already discussed here, and was favorably looked upon. I use it to keep my desktop clear and categorize when I install a new application. I used to use it for launching, but moved to TrueLaunchBar because of being able to put it on my taskbar, rather than anything wrong with fences.