Drools is a rule engine, DMN engine and complex event processing (CEP) engine for Java.
created at Feb. 18, 2011, 8:37 a.m.
StackStorm (aka "IFTTT for Ops") is event-driven automation for auto-remediation, incident responses, troubleshooting, deployments, and more for DevOps and SREs. Includes rules engine, workflow, 160 integration packs with 6000+ actions (see https://exchange.stackstorm.org) and ChatOps. Installer at https://docs.stackstorm.com/install/index.html
created at April 23, 2014, 12:51 a.m.
Java DSL for easy testing of REST services
created at Oct. 21, 2010, 8:35 a.m.
Pentaho Data Integration ( ETL ) a.k.a Kettle
created at Oct. 8, 2013, 6:27 p.m.
A compact and highly efficient workflow and Business Process Management (BPM) platform for developers, system admins and business users.
created at Oct. 13, 2016, 7:21 a.m.
Scalable real-time messaging server in a language-agnostic way. Self-hosted alternative to Pubnub, Pusher, Ably. Set up once and forever.
created at March 31, 2015, 8:26 p.m.