Open Source B2B Software Under GNU GPLv3 License

MA

Matomo

4.5/5.01 verified review

Freemium·Open Source·GPL-3.0

Privacy-first web analytics platform with complete data ownership and flexible cloud or on-premise deployment.

• Complete ownership of collected data without sampling or blocking loss.
• Open-source self-hosted edition available without base license fees.
• Advanced regulatory compliance with GDPR, CCPA, and privacy laws.

22.0kstars on GitHub

ER

ERPNext

4.4/5.01 verified review

Freemium·Open Source·GPL-3.0

Open source enterprise resource planning software for comprehensive business management.

• 100% open source architecture with no proprietary vendor lock-in.
• Complete modular ecosystem covering accounting, inventory, and human resources.
• Full self-hosting capabilities for total control of corporate data.

40.8kstars on GitHub

TU

Tuta

4.4/5.01 verified review

Freemium·Open Source·GPL-3.0

End-to-end encrypted secure email, calendar, and contacts with quantum-safe protection.

• End-to-end encryption with quantum-resistant cryptographic algorithms.
• Zero-knowledge architecture applied to calendars and contact lists.
• Proprietary infrastructure hosted in secure data centers in Germany.

8.1kstars on GitHub

AT

AtroPIM

4.1/5.01 verified review

Freemium·Open Source·GPL-3.0

Highly configurable, modular, open-source PIM system with headless capabilities.

• Highly modular and extensible architecture.
• Full deployment flexibility (cloud or on-premises).
• Comprehensive REST API covering all custom configurations.

211stars on GitHub

VE

Vela

3.7/5.01 verified review

Contact Sales·Open Source·GPL-3.0

Vela 0.1 beta desktop environment featuring native Bluetooth, X11 app support, and signed Linux packages.

• Advanced window management with snap layouts and virtual desktops.
• Native Bluetooth support and X11 applications running at native resolution.
• Cryptographically signed packages for Arch, Fedora, and Ubuntu.

80stars on GitHub

OP

OpenOutreach

3.7/5.01 verified review

Paid·Open Source·GPL-3.0

B2B lead generation service providing curated and reasoned LinkedIn profiles.

• Delivers leads with qualitative, personalized reasoning.
• Transparent pay-per-lead business model.
• Selection engine is open-source.

31stars on GitHub