The following is a list, in no particular order, of the tools and services I use to make things. It covers software and hardware but leaves out obvious things like Photoshop and the like.

Autodesk Fusion 360
Incredibly easy to use, yet sophisticated tool to create mechanical 3D models. I use it a lot for creating enclosures for my projects.

Locust
Need to check that web app you've built to see if it'll hold up to lots of web traffic? Locust is the way to do it.

Paint Code
Stop making bitmap graphics for iOS apps. Use Paint Code and get resolution independent code that will render your graphics at runtime.

Sizeup
Little moments managing your windows mount up during the day. Use Sizeup to tame them and get back that valuable time.