Austin Ginder has come up with an experimental way to deploy multiple WordPress sites on a single install without using multisite. He calls it “stackable WordPress.” 📚
“I see this being a good option for small, low usage WordPress sites. Even better if it’s a no usage site. As in WordPress site that has no visitors and is used exclusively as a tool to output static content.”
You can give this a try, although Austin warns it is clearly in the early stages.
I also discovered another nice post from Austin: How to getting notified via email when plugins are updated by hooking into the Simple History plugin.