What are some alternatives?
When comparing Zero Install and Sumo, 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.
ChannelAdvisor - As your partner in e-commerce success, we’re here to help you acquire more customers and land more sales than ever before. We keep our customers growing — and we have the stats to prove it.
Ketarin - Ketarin is a small application which automatically updates and optionally installs setup packages...
Pure360 - Email Marketing Software and Services
Chocolatey - The sane way to manage software on Windows.