This GPIO Pinout is designed to be both a quick and interactive reference to the Raspberry Pi GPIO pins, plus a comprehensive guide to your Raspberry Pi's GPIO interfaces. It also includes dozens of pinouts for Raspberry Pi add-on boards, HATs and pHATs.
There is also an Electron webshit version for download.
Online version, free to use: https://app.diagrams.net/
A chart and diagram webapp written in HTML5 that lets you do pretty much whatever Lucidchart does. Export to PNG, GIF, and JPEG.
A website that lets you draw ASCII diagrams with your mouse.
An encyclopedia of data visualization methods, charts, and paradigms. explanations When to use what chart for what kind of data and why.
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