I know this has been done before, but for the benefit of OP a list of features may be more helpful than people's say so ( i use isboxer )

Keyclone: basic key broadcaster with window swap and very limited mouse broadcaster $20 one off
Hotkeynet: scripted broadcaster with plenty of flexibility, free i believe but harder to setup
Alt-tab: win
Innerspace/ isboxer: rolls royce and online support. Wizard included for quick set up. Dont underestimate how long that could take with other software.
Pwnboxer: no idea, does anyone have facts on this( no opinions please)