How to Pick the Best Open‑Source Workflow Engine for Your Project

Background

Developing low‑code platforms, ticketing systems, OA systems, and BPM software requires visual business process designers and workflow capabilities. The core components are a process engine and a designer. Popular open‑source engines include Activiti, Flowable, Camunda, jBPM, and osworkflow; common designers include bpmn‑js, mxGraph, activiti‑modeler, flowable‑modeler, and react‑flow.

Process Engine Survey

Activiti

Activiti, originally developed by Alfresco, is now at version Activiti Cloud 7.1.0. Activiti 5 and 6 were led by Tijs Rademakers, who left in 2017 to create Flowable. Maintenance of Activiti 5/6 was handed to the Salaboy team, which later released Activiti 7, largely a wrapper around Activiti 6. Activiti Cloud splits the system into Runtime Bundle, Audit Service, Query Service, Cloud Connectors, Application Service, and Notification Service, enabling cloud‑native integration via HTTP APIs.

Flowable

Flowable is a fork of Activiti 6, currently at v6.7.0. It fixes many Activiti 6 bugs and adds DMN and BPEL support. It provides BPMN, CMMN, DMN, and Form engines. The project is Java‑based, lightweight, and open‑source under Apache V2.

Camunda

Camunda originates from Activiti 5 and retains the PVM. The latest version is 7.17. It offers strong performance and stability, supporting BPMN, CMMN, and DMN, and includes powerful modeling, task management, monitoring, and user management tools.

jBPM

jBPM, developed by JBoss, is now at version 7.61.0.Final. Since jBPM5 it diverged from earlier versions, rebuilding on Drools Flow. It uses Hibernate for persistence, which is less common today.

osworkflow

osworkflow is a lightweight engine based on a state‑machine mechanism with minimal database tables. It provides steps, conditions, loops, splits, and joins but lacks built‑in support for countersign, jumps, returns, or add‑sign, requiring custom extensions. It suits simple workflows.

Process Designer Survey

bpmn‑js

bpmn‑js is a BPMN 2.0 rendering and web‑modeling toolkit, aiming to become part of Camunda BPM. It is pure JavaScript and integrates easily with Vue, React, and other frameworks.

mxGraph

mxGraph is a powerful JavaScript diagram library used by ProcessOn and draw.io to create interactive flowcharts and can be customized extensively.

activiti‑modeler

The Activiti open‑source distribution includes a web‑based designer (activiti‑modeler) that is easy to integrate but has a simple, less attractive UI.

flowable‑modeler

Flowable provides a similar web designer (flowable‑modeler) with comparable functionality and the same integration advantages and UI drawbacks.

react‑flow

react‑flow is a React library for building node‑based applications, offering highly customizable nodes and edges, mini‑map, and controls, but it does not support BPMN diagrams.

Comparison

Camunda offers the richest feature set and superior performance among the engines, making it a strong candidate for open‑source workflow selection. bpmn‑js enables easy BPMN diagram creation and integrates well with front‑end frameworks, while react‑flow provides flexible, custom‑styled node graphs. Both designers are viable choices depending on whether BPMN compliance or visual flexibility is prioritized.

Outlook

Future trends point toward cloud‑native, micro‑service‑based workflow services accessed via HTTP APIs, reducing tight coupling with specific engines. The convergence of AI and RPA is driving intelligent, automated process platforms, and RPA is becoming an essential component of BPM solutions. Consequently, workflow engines will evolve to be micro‑service‑oriented with built‑in RPA capabilities.

The Quark Low‑Code Platform plans to redesign its workflow framework in Go, decouple services, and adopt a highly customizable designer to deliver a powerful and aesthetically pleasing user experience.