The Shelly i3 module has NO relays but it is small enough to be installed anywhere. It can command other  Shelly devices connected, through discrete commands on the home network via HTTP, MQTT, CoAP.

Shelly Plug S can turn on/off any device that is plugged in the wall, up to 2500W. It can also report power consumption.

Shelly On/Off module can switch a load up to 2500W. It can be installed behind the wall switch or wall plug and it needs a Neutral wire in order to operate.

Shelly 2.5 module can control two loads up to 1500W each. Also, it can be used to control a bi-directional motor (rollers / blinds), also having a roller shutter function. The module need a Neutral wire in order to function.

Shelly Dimmer 2 module can control the intensity of the lights it's connected to. The module doesn't need a Neutral wire in order to function.

Shelly Flood sensor also has included a temperature sensor.

Temperature Sensor Add On for Shelly 1 / Shelly 1PM

Shelly RGBW 2 is a wi-fi module that can control RGBW lights. No Hub required!

Shelly EM module can monitor 2 circuits, up to 120A each. It also has a contactor that can switch a load up to 2A.

The package contains 1 x Shelly EM + 1 x 120A clamp. You can also purchase an additional clamp.