ifttt - IFTTT puts the internet to work for you. Create simple connections between the products you use every day.
Apache Airflow - Airflow is a platform to programmaticaly author, schedule and monitor data pipelines.
Zapier - Connect the apps you use everyday to automate your work and be more productive. 1000+ apps and easy integrations - get started in minutes.
Pushwoosh - Push Notifications Service | Your Apps Can Talk!
Microsoft Flow - Similar to IFTTT and Zapier you can create automated tasks based on APIs from various services.
Pipefy - Pipefy is a process management software that empowers anyone to create and automate efficient workflows on their own without code.