Asynchronous flow control (promises, generators, observables, CSP, etc)

Graph / node editor in the browser using VueJS

Rule engine/process engine, committed to solving flexible and complex hard-coded problems, for complex/flexibly changing business, provide a new abstract orchestration solution that is lightweight, high-performance and provides visual operation pages. Java规则引擎-ice，针对复杂/灵活变动业务，提供一个新的抽象编排解决方案，轻量级，高性能并提供可视化操作页面

A Python concurrency scheduling library, compatible with asyncio and trio.

TaskChain Control Flow framework. Helps facilitate running tasks on an application's "Main Thread" (such as a game), and tasks off the main (async).

extremly light uart library for AVR 8 bit microcontrollers

SLANG engine written in Go

The chainy core + autoloader plugin

Concurrency management for Vuejs.

C# co-routine Kernel for .Net. Includes Futures, Barriers, Triggers, Timers and Groups. Gamasutra article provides extra documentation.

Java编程之路

Group together synchronous and asynchronous tasks and execute them with support for concurrency, naming, and nesting.

Avoid complex flows between fragments/views/whatever

Elixir style cond for easy javascript control flow

Enhanced concurrency primitives for Javascript.

A tiny Promise-inspired control flow library for browser and Node.js.

Build, execute and represent pipelines (aka workflows / templates) in Go

Flow control harness for implementors. Builds a Deferred object that supports async/await, promise chaining, and conventional Node callbacks.

Python driver and command line tool for Alicat mass flow controllers.

Ruby framework for your Business Logic Layer