Recs.
Updated
Specs
Pros
Pro Copy and paste images and text between PCs including formatted text and bitmaps.
ShareMouse can share the clipboard between multiple computers.
Instead of overwriting all remote clipboards, ShareMouse performs the clipboard synchronization on the target computer of your choice.
Use CTRL-V to insert the local clipboard and SHIFT-CTRL-V to insert a remote computer's clipboard contents.
Pro Zero configuration installation
ShareMouse does not require any configuration at all. Fire up the client on each computer and drag the mouse to the monitor of the other monitor.
ShareMouse automatically determines the monitor layout without manual configuration. No fiddling with IP addresses or port configuration.
Pro Freeware for personal use
ShareMouse is free for personal use: for two computers, with 1 monitor each (there are two monitors max for free account).
Cons
Con Terrible customer support
If it works for you, then great...but don't even TRY to ask for help if something goes wrong.
Con Seriously unreliable
Continuously loses the connection between computers and requires frequent reloading.
Con Has issues with 2-way sync
If you use 2 mice and 2 keyboards simultaneously, there are issues with keyboard focus. For the first PC keyboard to work on the second computer, you need either to use hotkeys to switch focus, or to use the first PC mouse to move the cursor to the second computer. If the cursor is moved by the second PC mouse, the first PC keyboard focus will not switch, causing a confusion, when one keyboard works on both computers, but the other keyboard works on one computer only.
Con Could not get the 2 Macs to connect
It connected for two seconds then disappeared from one of the machines.
Recommendations
Comments
Flagged Pros + Cons
Con No audio transmission
ShareMouse does not transmit audio to save network bandwidth.
The purpose of a software kvm is to control multiple computers which are sitting on the same desk. It requires all computers to stand next to each other. If you wish to listen to audio of any such PC, increase volume on that PC.
Out of Date Pros + Cons
Con A lot of advanced features, which are not free-of-charge and don't have a trial
ShareMouse is made by a professional company and advanced features are not free-of-charge. A lot of the features are "advanced" and there is also no way to try them out.