Open-Source CRM · getrebuild

rebuild

Rebuild is a low-code/no-code enterprise management platform built in Java that enables rapid configuration and deployment of CRM, ERP, WMS, MES, and other business systems without custom coding. It is dual-licensed under GPL-3.0 (free for internal enterprise use) and commercial licenses, with an active development cycle and 1,017 GitHub stars.

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Source: GitHub — github.com/getrebuild/rebuild

GitHub stars

244

Forks

Java

Primary language

GPL-3.0

License (OSI-approved)

Key facts

Objective fields from the source. Values we can't verify are shown as “Unknown” rather than guessed.

Field	Value
Repository	getrebuild/rebuild
Owner	getrebuild
Primary language	Java
License	GPL-3.0 — OSI-approved
Stars	1k
Forks	244
Open issues	8
Latest release	4.4.2 (2026-07-06)
Last updated	2026-07-06
Source	https://github.com/getrebuild/rebuild

What rebuild is

Java-based SpringBoot application with MySQL backend, Redis caching support (optional Ehcache fallback), and modular architecture supporting jar/war packaging. Provides REST APIs for integration, graphical workflow/entity configuration, and mobile support. Deployable standalone or via Docker.

Quickstart

Get the rebuild source

Clone the repository and explore it locally.

terminalbash

1git clone https://github.com/getrebuild/rebuild.git2cd rebuild3# follow the project's README for install & configuration

Need it deployed, integrated, or customized instead? DEV.co ships production installs.

Best use cases

Mid-market CRM/ERP rollout

Organizations needing rapid CRM, WMS, or ERP deployment without dedicated development capacity. Configuration-driven approach allows IT admins to build systems weeks instead of months.

Internal workflow and approval automation

Enterprise teams replacing legacy OA, email, or spreadsheet-based processes. Built-in approval center, triggers, and workflow engine handle common business logic without coding.

System migration and consolidation

Companies moving from legacy systems (SAP, Oracle, etc.). Multi-entity data models, audit trails, and custom field support ease migration and reduce rework.

Implementation considerations

GPL-3.0 license mandates review by legal/procurement before deployment; commercial licensing path exists but terms not disclosed in public data. Clarify applicability to internal vs. external use.
Database design (MySQL schema, entity relationships, multi-language support) is critical; data migration tooling and examples should be validated against legacy systems.
Configuration proficiency required: project emphasizes graphical zero-code UI but assumes operational staff can design entities, workflows, and approval logic without engineering support.
Upgrade path and backward compatibility: v4.4.2 is latest (2026-07-06); assess release frequency, deprecation policy, and impact of plugin/custom extensions on major updates.
Redis optional but strongly recommended for production; default Ehcache in-memory cache is inadequate for multi-instance or high-concurrency deployments.

When to avoid it — and what to weigh

GPL-3.0 incompatible licensing constraints — If your codebase or deployment model cannot accommodate GPL-3.0 copyleft obligations (requires derivative works to be open-source), commercial license must be purchased—unclear if internal deployments avoid this.
High-scale SaaS or white-label requirements — No evidence of multi-tenancy, role-based SaaS licensing, or white-label branding. Project targets internal enterprise use and on-premise deployment.
Bleeding-edge AI/ML or advanced analytics — AI assistant mentioned in v4.4 but no details on scope, training data, or integration depth. Not positioned as an analytics-first platform; focus is configuration and workflow.
Minimal Java infrastructure or legacy Windows-only constraints — Requires JDK 1.8+, MySQL 5.6+, and Maven. If environment prohibits Java or cannot provision MySQL, deployment friction is high.

License & commercial use

Dual-licensed: GPL-3.0 (free for internal enterprise use, copyleft applies to modifications) and commercial license (terms not disclosed in public data). Use constitutes acceptance of service terms at getrebuild.com/legal/service-terms. Derived works or plugins may trigger copyleft obligations—legal review essential before internal deployment or extension.

GPL-3.0 permits internal enterprise use at no cost, but any modification or integration touching GPL code requires derivative works to be open-sourced. Commercial license available and recommended for custom development, proprietary extensions, or liability protection; pricing and scope not publicly documented. Organizations offering services using Rebuild should require legal/IP review before engagement.

DEV.co evaluation signals

Editorial assessment — not user reviews. Directional, with an explicit confidence level.

Signal	Assessment
Maintenance	Active
Documentation	Adequate
License clarity	Needs review
Deployment complexity	Moderate
DEV.co fit	Good
Assessment confidence	High

Security considerations

Default credentials (admin/admin) on demo environment; production deployment must enforce strong password policies and disable default accounts immediately. No public security audit, CVE history, or penetration test results disclosed. Code quality badges (Codacy, codecov) indicate some static analysis but do not substitute for security review. GPL-3.0 source availability aids community audit but does not guarantee secure defaults. Assess encryption (TLS in transit, data at rest), access control granularity, session management, SQL injection/XSS mitigations, and audit logging requirements against organizational policy before deployment.

Alternatives to consider

Odoo (Python, LGPL-3.0 + commercial)

Mature open-source ERP/CRM with larger ecosystem, stronger SaaS hosting, and modular apps. Higher adoption and third-party integrations, but steeper learning curve and licensing complexity.

ERPNext (Python, GPL-3.0 + Frappe commercial)

Lightweight, India-focused ERP with strong workflow/approval engine and active community. Mentioned in Rebuild README as peer. Lower resource footprint, but smaller vendor ecosystem than Odoo.

Saltedge / Zapier + bespoke low-code platform (e.g., Airtable, Bubble, Retool)

Cloud-native no-code alternatives avoid Java/MySQL infrastructure. Easier SaaS licensing and white-label, but less suitable for heavy ERP/MES workloads or on-premise deployments.

Software development agency

Build on rebuild with DEV.co software developers

Clarify GPL-3.0 copyleft obligations and commercial licensing with legal counsel. Test the online demo, review database/infrastructure requirements, and pilot configuration workflows with your IT team before production rollout.

Talk to DEV.co

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rebuild FAQ

Can we use Rebuild commercially (sell services or products built on it)?

GPL-3.0 free version permits internal enterprise use only. Selling services or products derived from Rebuild requires either purchasing a commercial license (terms not public) or open-sourcing your derivative work. Requires legal review before engagement.

What database backends are supported?

README specifies MySQL 5.6+. No mention of PostgreSQL, Oracle, or MSSQL. Verify before selecting if existing DBA constraints require alternative RDBMS.

Is Rebuild SaaS-ready or multi-tenant?

No evidence of multi-tenancy, role-based SaaS licensing, or hosted offering in public data. Project targets on-premise, internal enterprise deployment. Custom SaaS adaptation would require significant engineering.

How do we migrate data from our legacy system?

No dedicated migration tooling or ELT framework mentioned. Likely requires custom ETL via APIs, JDBC, or CSV import. Evaluate against legacy system format and volume before committing.

Custom software development services

From first prototype to production, DEV.co delivers software development services around tools like rebuild. Our software development agency staffs experienced software developers and web developers for custom software development, web development, integrations, and ongoing support across open-source crm and beyond.

Ready to evaluate Rebuild for your enterprise?

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