What are some alternatives?
Pipefy - The new development platform built for agile teams.
ifttt - IFTTT puts the internet to work for you. Create simple connections between the products you use every day.
Airflow - Airflow is a platform to programmaticaly author, schedule and monitor data pipelines.
KiSSFLOW - KiSSFLOW is a workflow tool & business process workflow management software to automate your workflow process. Rated #1 cloud workflow software in Google Apps Marketplace.
Integromat - Tool for workflow automation
Microsoft Flow - Similar to IFTTT and Zapier you can create automated tasks based on APIs from various services.