The prepared is a weekly email subscription about engineering and manufacturing world. They focus on Planning and Strategy, Making and Manufacturing, Maintenance, Repair, & Operations, Distributions, Logistics, Testing, Inspection, and Analysis, along with some weekly tangents.
I’ve been subscribed to it for the past year and find something new or interesting every week. They also have a great tool guide as shown below and a slack channel for paying members.
conceptualhardware.co 