Tasker - Tasker is an application for Android which performs Tasks (sets of Actions) based on Contexts...
ifttt - IFTTT puts the internet to work for you. Create simple connections between the products you use every day.
LibreTasks - Trigger actions when certain events happen.
Zapier - Connect the apps you use everyday to automate your work and be more productive. 1000+ apps and easy integrations - get started in minutes.
Automate - Automate various tasks on your Android smartphone or tablet.
n8n.io - Free and open fair-code licensed node based Workflow Automation Tool. Easily automate tasks across different services.