React - A JavaScript library for building user interfaces
Kissflow - Kissflow is a workflow tool & business process workflow management software to automate your workflow process. Rated #1 cloud workflow software in Google Apps Marketplace.
Vue.js - Reactive Components for Modern Web Interfaces
Pipefy - Pipefy is a process management software that empowers anyone to create and automate efficient workflows on their own without code.
Guava - Google core libraries for Java 6+.
Process Street - Create beautiful rich process documents in a simple to follow checklist format. Fast, free and incredibly simple to use.