Smart things hub doesn’t work with Sercomm zigbee devices—any alternatives?

The first sensor pictured and the lock should both work with SmartThings as both are using the ZHA zigbee profile. You would have to factory reset them, and then add them to the SmartThings network.

You can find more detailed discussion on the first sensor in the following thread (this is a clickable link)

The last sensor appears to be problematic: lots of reports by community members that they couldn’t get it to work. So you’re just going to have to check model by model.