It depends a lot on what you consider “Low Code” and what your target is. Corporate users tend to look at Mendix, OutSystems, etc. because they are typically looking at building end—to-end solutions, and those give you front-end, APIs and ORMs (or, rather, abstract all of those away).

Most OSS or IoT folk will immediately point to Node-Red or n8n.io, which look similar but are actually quite different in focus (n8n is geared at hooking up third-party services at a higher level).

And then you have all the Web Automation stuff that has been with us forever since Yahoo Pipes went down.