I've seen Microsoft Visio used pretty often in larger/non-tech companies. I opt for https://draw.io https://draw.io if I need a quick diagram personally (it's

I've seen Microsoft Visio used pretty often in larger/non-tech companies. I opt for https://draw.io https://draw.io if I need a quick diagram personally (it's a big plus that you can guarantee the recipient has access since it can be opened from the browser version).