For a little project i needed a module which can switch a relay using http requests, of course this is possible using a DIY combination with different products (raspberrypi + relay print) but it might not be stable enough for a non home setup. So i searched for a turn key solution and stumbled upon
webrelais
They have several versions with inputs / outputs / counters but for now i ordered one with 16 relays and a nice little dinrail power supply
It is also possible to set the relays to pulse, when pushed they will close for a second and then fall back. This is a feature u can use for opening gates, windows or other pulse controller devices

Running HS3PRO on PC with Z-Wave / OpenTherm / Plugwise / RFXcom / MQTT / XAP400 / Logitech Media Server and Squeezelite on PI`s