ifttt - IFTTT puts the internet to work for you. Create simple connections between the products you use every day.
Cisco Packet Tracer - Download Cisco Packet Tracer, an innovative network simulation and visualization tool used by Cisco Networking Academy students and instructors.
Zapier - Connect the apps you use everyday to automate your work and be more productive. 1000+ apps and easy integrations - get started in minutes.
ns-3 - a discrete-event network simulator for internet systems
n8n.io - Free and open fair-code licensed node based Workflow Automation Tool. Easily automate tasks across different services.
GNS3 - GNS3 is a graphical network simulator that allows simulation of complex networks.