Flecs - Multi-threaded Entity Component System written for C89 & C99
ifttt - IFTTT puts the internet to work for you. Create simple connections between the products you use every day.
EnTT - Header-only C++ game development library with innovative ECS (Entity-Component-System).
Zapier - Connect the apps you use everyday to automate your work and be more productive. 1000+ apps and easy integrations - get started in minutes.
EntityX - Fast, type-safe C++ ECS (Entity-Component System).
n8n.io - Free and open fair-code licensed node based Workflow Automation Tool. Easily automate tasks across different services.