Node-red also has a lot of connectors, from messaging eco systems to databases and is very flexible. If you hit a wall to the available node then you can always hand code Javascript in a function node.
The Raspbian Distro comes with Node-red pre-installed. Fastest and cheapest way to give it a try.
But there are some interesting new ones:
https://github.com/cantino/huginn
https://trigger-happy.eu/infos
not sure if this is alive: https://sourceforge.net/projects/semanticwebpipe
Do you know some other (open source) event and agent system tools? (there are tons of commercial hosted IFTTT clones, they are not interesting...)