Perfect tool to online design electronic circuits (PCB).
Exists online (registration is required) or downloadable standalone Windows, Linux and macOS.
The nicest feature is the large collection of components and associated footprints.
It is backed or supported by a large Chinese PCB manufacturer, that make (optionally) your circuit design a physical reality.
Privacy: we have no feedback of potential problem with this tool and author. But like many online services, you are here providing them with your own data. Depending of the criticity of your data, this is your responsibility to assess author's reputation and potential misusage, and to check and accept their terms and conditions, or not.
Free, No Download/Install required, Registration required
