The Hardware Engineering Hub is a free browser workbench for electronics and network-hardware engineers. It runs entirely in the browser and keeps working offline. No sign-up and no advertising.

• Engineering calculators with live, editable formulas
• Voltage regulator (VRM) and power delivery network (PDN) design helpers
• High-speed signal channel budgets
• A study library of hardware design notes
• An interactive circuit simulator (CircuitJS, open source)

Built and maintained by Niroj, a network-hardware engineer. More at hw-work.link.