"MCP servers that don't require API keys" matching MCP connectors:

M12 lens and C-mount lens finder with image-sensor matching and field-of-view calculator.

Frontier-design reference: file formats, converters, definitions, sensors, companies, design jobs.

Verified KiCad footprints, symbols & 3D models for AI agents. No signup, CC-BY-4.0, quality-gated.

IC datasheet search: parametric part finding, spec lookup, price comparison — grounded in real PDFs.

Medius docs: the binary control protocol, device behavior, and the medius Rust library.

Page-cited retrieval for embedded docs, datasheets, MISRA, CMSIS, and RTOS references.

Create RF signal projects from prompts, inspect graphs, and export IQ data.

Electronic component datasheets for AI agents — specs, pinouts, package data on demand.

device.house — words become circuits. Design devices: BoM, enclosure, firmware, routed PCB.

Cross-OEM industrial machine intelligence: identity, normalization, automation, attestation.

Run, build, and validate firmware on virtual hardware from your AI agent. Hardware knowledge corpus.

Query Allen-Bradley and Siemens PLC projects, live tag values, and analyses in plain English.

Documentation for the Spektralwerk spectrometer SCPI API as a streamable HTTP MCP Server