It's basically a piece of software for doing visual programming where workflows can be triggered by events (webhooks, web calls, and a bunch of other things). Has a self-hosting option which is quite nice.

As far as I used it (which was for like 15minutes) it's like Zapier but with deeper customizability and you can self host it.

More like an actor engine than IFTTT, a simple and good tool that can simplify workflows like "daily export data from HubSpot to Google spreadsheet, then send emails."