See source at https://github.com/tobiasquinn/gnome-shell-mousewheel-zoom
Install for Ubuntu:
sudo add-apt-repository ppa:tobias-quinn/gsmz
sudo apt-get update
sudo apt-get install gnome-shell-mousewheel-zoom
Done. Zoom with Alt+Mousewheel.
Since around Cinnamon 2.2 APIs has changed so much that the Gnome Shell Mouse Wheel Zoom application no longer works with Cinnamon. However, Cinnamon has integrated zoom as an accessibility feature. All you need to do is to open Cinnamon Preferences and select
Accessibility and toggle
ON. After that
Mouse wheel up/down zooms the desktop. You can even adjust the scrolling behavior in
Options... - I recommend using full screen for the zoom and selecting
Magnifier cursor pushes contents around.