Popular Alternatives to Podio/Globiflow for Workflow Automations

I build a pretty intricate setup for a my small business using Podio & Globiflow. That ended up being my favorite part of running the business, so now I'd like to do try and build a career around doing that for other companies. Having said that, Podio/Globiflow does not seem to be very popular compared to a lot of alternatives, but I'm having trouble figuring out what other programs are similar in terms of automation ability, and which ones might be worth learning.

Any advice (in comments or through a DM) would be really appreciated.