Climb checks your composer files to see which packages are outdated, regardless of your version constraints. Without Climb, there's no way of knowing if a package has a new major release unless you use a notification system like Gemnasium. Climb is one of those tools you just need to get on your tool belt.
Uptime and SSL certificate monitoring doesn't have to be boring, confusing or expensive. Together with my buddy Mattias Geniar I'm currently building Oh Dear: a webapp to keep an eye on the health of your websites. Register here to try it out. (sponsored link)