What are some alternatives?
When comparing Zero Install and Ketarin, you can also consider the following products
Ninite - Ninite is the easiest way to install software.
Patch My PC - Patch My PC Updater is a free, easy-to-use program that keeps over 300 apps up-to-date on your computer.
Chocolatey - The sane way to manage software on Windows.
Sumo - Free tools to grow your email list.
Just Install - just-install - The stupid package installer for Windows.
FileHippo App Manager - Scan your computer for installed apps to check if updates are available.