Security Open Source Tools

Alternative toRollbar

Real-time error tracking with performance monitoring and traces

• 2,216 GitHub stars
• MITLicence MIT
• #Monitoring

Alternative toDiscord

Free open source Discord reimplementation with full API parity

• 2,210 GitHub stars
• AGPL-3.0Licence AGPL-3.0
• #Chat

Alternative toSplunk

Open source cloud-native SIEM on a security data lake

• 1,695 GitHub stars
• Apache-2.0Licence Apache-2.0
• #Security

Alternative toWorkOS FGA

Run fine-grained authorization with RBAC, ABAC, and ReBAC

• 1,335 GitHub stars
• Apache-2.0Licence Apache-2.0

Alternative to1Password

Store passwords in an encrypted local database, no cloud account

• 884 GitHub stars
• Artistic-2.0Licence Artistic-2.0
• #Security

Alternative toSnyk

Security scanner for AI agents, MCP servers, and LLM codebases.

• 861 GitHub stars
• MITLicence MIT

Alternative toDocuSign

Open source e-signature platform for PDF signing and forms

• 834 GitHub stars
• AGPL-3.0Licence AGPL-3.0
• #Security

Alternative toAuth0

Composable authentication for modern Go backends

• 551 GitHub stars
• MITLicence MIT

Alternative toGoogle Chrome

Speed-first browser for KDE Plasma with built-in ad blocking

• 494 GitHub stars
• GPL-3.0Licence GPL-3.0

Alternative toGoogle Chrome

Chromium-based browser with enhanced privacy and security

• 412 GitHub stars
• BSD-3-ClauseLicence BSD-3-Clause