Open-source alternatives to Clara Rules

Flowable Engine is a business process management platform and workflow engine used to automate business processes and orchestrate human and system activities. It provides a suite for modeling, deploying, and executing complex workflows and decision rules across distributed environments, including a dedicated case management system for unstructured processes and ad-hoc activities. The platform is a Kubernetes native workflow orchestrator that can be deployed as a containerized service using manifests and Helm charts. It supports an embedded runtime model, allowing the engine to integrate as a

RulesEngine is a business logic evaluator for .NET that executes complex rule workflows and dynamic expressions against input data. It functions as a dynamic expression evaluator and an externalized logic framework, allowing the definition and management of business rules in JSON format to change application behavior without recompiling code. The project decouples decision logic from source code by loading policies from external files or databases. It supports the registration of custom classes and methods to extend standard expression capabilities through type injection. The framework cover

This project is a Python-based business rules engine designed to decouple application logic from source code. It provides a framework for defining and executing dynamic conditional logic, allowing system behavior to be determined by data criteria rather than hard-coded instructions. The system distinguishes itself by offering a declarative policy framework that utilizes a domain-specific language to manage complex rules. By mapping internal object attributes to dynamic variables and registering executable actions, the engine enables the creation of automated decision-making workflows that can

Direct File is a federal tax filing application designed to collect taxpayer information and transmit federal tax returns to a government API. It functions as a tax data export tool, enabling the transfer of federal return data via XML or JSON to third-party state and local tax software. The system utilizes a declarative knowledge graph to manage complex business rules and partial data sets across both client and server environments. The application employs an interview-driven process to collect information and uses a schema-based export system for tax data exchange. It integrates data stora

Grule is a business rule engine for Go that decouples complex decision-making logic from core application code. It provides a framework for defining, versioning, and executing business rules through a domain-specific language, allowing logic to be managed independently of the underlying software implementation. The engine distinguishes itself by utilizing a formal grammar-based parser and a Rete-inspired pattern matching algorithm to evaluate logic against data facts efficiently. It supports dynamic system modeling by enabling runtime updates to policies and providing thread-safe knowledge ba

Liteflow is a component-based rule engine and workflow orchestrator used to define business logic through a chain of reusable components. It utilizes a structured data language to map logic paths, functioning as a dynamic workflow engine for managing sequences of synchronous and asynchronous tasks. The project is distinguished by its support for hot deployment, allowing rule definitions and execution logic to be updated in real time without restarting the application. It also features a multi-language scripting engine that embeds external scripts into business rules to enable flexible logic c

QLExpress is a dynamic scripting engine and expression language for the Java platform. It functions as a runtime expression evaluator and business rule engine, allowing applications to execute scripts and evaluate business logic without requiring system recompilation. The engine distinguishes itself through a secure scripting sandbox that enforces security policies via class whitelisting and execution timeouts. It supports high-precision mathematics to prevent rounding errors and provides language alias support to create domain-specific languages that resemble natural language. Additional cap

Go-workflow is a lightweight library designed for defining and executing business process logic through a state-machine engine. It enables the automation of multi-step operations by managing task lifecycles, approval consensus, and the progression of processes through defined stages. The engine utilizes a data-driven approach where business processes are structured as serialized JSON arrays, allowing for the definition of routing paths and task sequences without the need for visual modeling tools. It supports hierarchical node nesting to represent complex, multi-stage workflows and employs co

Activiti is a workflow engine designed to model, execute, and manage business processes using the BPMN 2.0 standard. It functions as a Java-based framework that embeds process orchestration directly into enterprise applications and microservices to coordinate sequences of tasks and human-centric interactions. The platform utilizes a persistent state machine to maintain the status of long-running workflows in a relational database, ensuring continuity across system restarts. It manages high-volume environments through optimistic concurrency control, which tracks versioning tokens to prevent da

Appsmith is a low-code platform designed for building internal business tools, such as operational dashboards and administrative panels. It enables developers to construct dynamic user interfaces by dragging and dropping modular widgets onto a canvas and binding them directly to backend data sources. The platform utilizes a reactive framework that automatically updates interface elements and triggers functions whenever underlying data or widget properties change, eliminating the need for manual event handling. The platform distinguishes itself through a server-side proxy architecture that exe

This platform is a modular, metadata-driven framework designed for building custom business applications and data management systems without traditional coding. It functions as a low-code environment where data models, user interfaces, and business logic are defined through visual configurations rather than hardcoded views. The architecture supports multi-tenant isolation, allowing multiple independent applications to run within a single shared memory space while maintaining strict logical separation of data and configurations. What distinguishes this system is its deep integration of artific

xboot is a full-stack development platform and low-code application framework pairing a Spring Boot backend with a Vue.js frontend. It provides a scaffolding environment for enterprise application development, focusing on rapid development through automated code generation for business logic, interfaces, and data operations. The platform features a visual workflow orchestrator for modeling and executing multi-step business process automation and an identity and access manager implementing OAuth2, single sign-on, and social login integration. It includes a distributed system utility suite that

EspoCRM is an open-source customer relationship management platform and SQL-based business application. It serves as a centralized web interface for tracking leads, opportunities, and contacts, providing a sales pipeline manager and a customizable business logic engine. The platform is distinguished by its ability to function as a custom business application builder, allowing for the creation of tailored entities and automated workflows. It integrates marketing automation tools for campaign coordination and a structured customer support ticketing system for case management. The system covers

Power-Fx is a declarative logic framework and low-code formula language based on Excel formulas. It functions as an expression parser and evaluator that transforms formula strings into an abstract syntax tree to execute logical operations and resolve values. The project provides a standardized integration layer to connect formula-based logic to external data sources for querying and pushing records. This allows for the definition of business rules and calculations that can be shared as consistent logic across different applications and platforms.

Baserow is a self-hosted, no-code relational database platform built on PostgreSQL. It provides a spreadsheet-like interface for structuring and managing data without writing code, while exposing all database resources via a REST API to support headless architectures. The platform distinguishes itself by integrating large language models and embedding servers to power AI assistants and automated data generation. It further extends its utility as a no-code application builder, allowing users to create custom internal portals, dashboards, and business tools using visual logic and managed data.

Conductor is a distributed workflow manager and microservices orchestration engine. It coordinates long-running business processes across a network of services, using a stateful orchestration model to ensure consistent execution order and reliable state management. The system defines task sequences and conditional business logic using structured JSON configuration files. It manages the execution of complex operations across distributed systems with built-in persistence and failure recovery, tracking the progress of processes through a backend database. The platform provides capabilities for

This project is a library of pre-configured n8n workflow templates and structural blueprints designed for automating business processes and AI tasks. It provides a collection of JSON files that can be imported into a workflow engine to deploy automation sequences, including specialized configurations for integrating vector databases and large language models. The collection focuses on the development of context-aware AI agents, utilizing memory buffers and retrieval systems to create intelligent data generation and retrieval pipelines. It includes dedicated blueprints for retrieval augmented

o2oa is an open-source Java enterprise office automation platform designed to manage corporate workflows, organizational hierarchies, and collaborative office tasks. It functions as a low-code business application platform and a corporate information portal, providing a visual development environment for building custom enterprise applications. The platform is distinguished by its integrated enterprise workflow engine, which allows for the design and automation of business processes using customizable routing conditions and event-driven scripts. It further differentiates itself as a multi-dat

Qor is a Go admin framework and backend toolkit used for building administrative interfaces, headless content management systems, and REST API generators. It provides a structured environment for implementing business application backends, specializing in the management of structured content and media assets. The project distinguishes itself through comprehensive multi-language content management, featuring locale-based data versioning and a dedicated system for internationalization and translation administration. It further differentiates its offering with a built-in state machine implementa

SuiteCRM is an open source customer relationship management platform and PHP web application. It serves as a customizable business suite designed for managing sales, marketing, and service operations within a self-hosted environment. The platform provides tools for tracking leads and sales pipelines, organizing customer contact information, and managing customer support tickets. It also includes capabilities for marketing campaign automation and business process automation to handle repetitive administrative tasks. The system supports visual customization through custom themes and includes s

The expression-language is a lightweight calculation component and parser tool that compiles and evaluates single-line string expressions against runtime variables. It functions as an expression engine that parses logical expressions into executable code or evaluates them directly against provided variables and functions to power dynamic rule evaluation and configuration. The engine features a complete architecture covering lexical tokenisation, intermediate code generation, and execution caching. It parses expression strings into hierarchical abstract syntax trees to enable programmatic insp

Jeesite is a full-stack low-code development framework designed for building enterprise administrative portals using Spring Boot, MyBatis, and Vue. It functions as a comprehensive platform for creating administrative dashboards with integrated role-based access control and organizational data permission systems. The framework distinguishes itself through a combination of automated CRUD code generation and an integrated RAG platform that connects large language models to enterprise data via vector stores. It further incorporates a BPMN-based workflow engine to automate complex business process

This project is an open-source customer relationship management platform that functions as a low-code application development framework. It provides a unified interface for tracking sales pipelines, managing customer interactions, and automating lead routing. The platform is built to serve as a business process automation tool, allowing users to define custom data structures and workflows to streamline operational tasks. The system distinguishes itself through its metadata-driven architecture, which enables dynamic form generation and relational document modeling. By utilizing server-side scr

imove is a visual workflow engine and low-code logic designer that allows for the creation of executable business rules via flowcharts. It functions as an event-driven process orchestrator, triggering specific logical sequences based on user interface interactions or external network signals. The platform operates as a node-based automation system where data is processed through a chain of discrete, parameterizable code modules. It converts graphical flowchart representations into executable logic steps for both server and client-side processing. The system supports modular logic engineering

Illa-builder is a low-code internal tool builder and API integration platform used to create business applications and admin panels. It functions as a database GUI dashboard and visual workflow automator, allowing users to connect to databases and external APIs to manage data and automate business processes. The platform provides a self-hosted app framework that can be deployed on private infrastructure via Docker. It enables the creation of custom dashboards and CRMs while maintaining full control over data and hosting. The system includes a visual drag-and-drop canvas for designing user in

Camunda is a business process automation platform and orchestration tool used to model, deploy, and monitor automated workflows and human-centric tasks. It features a BPMN workflow engine for executing processes based on the BPMN 2.0 standard and a DMN decision engine for automating business logic and rule evaluation. The platform is designed for flexibility through an embedded workflow library that allows the engine to be integrated directly into custom applications. It supports multi-tenant workflow management, enabling the secure separation of process definitions and instance data for mult

Baserow is a no-code relational database and application builder that allows users to create structured data tables and business tools through a visual interface. It functions as a headless REST API data backend and a self-hosted data workspace, providing a platform for managing collaborative databases while maintaining full control over data residency. The platform integrates large language models to serve as an LLM-powered data platform, capable of generating database structures, record content, and technical workflows from natural language. It also acts as a Model Context Protocol server,