Telguard Will look like a Z wave on/off switch. It was popular back when the go control sold for about $160, but once the price came down on that one, not as many people went for the telguard.
Although the original poster in the following thread was using IFTTT, you certainly don’t have to: it’s a Z wave device and connects to the smartthings hub same way as the gocontrol does.
Garadget is cloud to cloud, also pretty popular
Aeotec has a zwave one, but it’s hard to find on the US frequency. There are some EU members that have it. @TheSmartestHouse May know if Aeotec intends to distribute it on the US frequency.