Mango-lassi lets you to share mouse and pointer with other computers using Avahi. It has features like:
* Fully peer-to-peer. All Mango Lassi instances are both client and server
at the same time. Other hosts may enter or leave a running session at any
time.
* No need to open X11 up for the network.
* You have a 50% chance that for your setup you don't need any configuration
at all. In the case of the other 50% you might need to swap the order of
your screens manually in a simple dialog, because Mango Lassi didn't guess
correctly which screen is left and which screen is right.
* libnotify integration so that it tells you whenever a desktop joins or
leaves your session.
* Shows a nice OSD on your screen when your screen's input is currently being
redirected to another screen.
* Uses all those nifty GNOME APIs, like D-Bus-over-TCP, Avahi, libnotify,
Gtk,..
* Supports both the X11 clipboard and the selection, supporting all content
types, and not just simple text -- i.e. you can copy and paste image data
between Gimp on your screens.