3 Best Open Source Glean Alternatives
A curated collection of the 3 best open source and self-hosted alternatives to Glean in 2026.
Looking for a free, privacy-friendly, or self-hosted replacement for Glean in 2026? The top open-source alternative is Onyx — Open-source enterprise search & AI assistant.
Other highly rated open-source Glean alternatives include Pipeshub and Vertex AI.
Open-source enterprise search & AI assistant
Onyx is an open-source AI enterprise search platform that transforms how teams access and interact with company knowledge. By connecting to all your apps, documents, and people, Onyx delivers accurate, context-aware answers grounded in your team's data. - Deep Research & AI Chat: Advanced research capabilities with MCP, code interpreter, web search, and contextual retrieval for precise answers. - Real-Time Syncs: Plug-and-play connectors that sync updates across all your apps while respecting fine-grained access controls. - Hybrid Search & RAG: Combines hybrid search, advanced RAG, and LLM-based knowledge graphs for reliable, trustworthy responses. - Customizable & Transparent: Flexible configuration for LLM providers, search settings, and developer tools with full code transparency. - Enterprise Security: Built with SOC 2 Type II compliance, GDPR adherence, and granular permissions for secure deployments. - Developer-Friendly: Modular architecture with clean interfaces, built-in agent framework, and extensive documentation. - Benchmarked Performance: Tested on 99 real workplace questions across 220K documents, outperforming major AI assistants in blind evaluations. - Use Case Coverage: Improves productivity across engineering, sales, support, and company-wide teams with tailored AI solutions. Onyx is fully open-source and can be self-hosted on any infrastructure. The platform supports flexible deployment options, including cloud and on-premises, with transparent usage tracking and customizable configurations. Comprehensive self-hosting guides and developer documentation are available to ensure smooth deployment and integration.
Open-source enterprise AI with explainable search
PipesHub is the unified AI context layer for enterprises, designed to break down data silos and power explainable AI agents across connected business applications. - Explainable Search & Answers: Delivers trustworthy results with pinpoint citations, page references, and direct links to source documents across connected systems (Drive, Slack, Jira, Email, etc.). - Knowledge Graph-First Retrieval: Structured reasoning across documents, entities, and metadata—not just keyword matching—for accurate, context-aware responses. - Self-Hosted & Open Source: Apache 2.0 licensed. Deploy anywhere, audit every line, and retain full control over your data and AI spend. - Model Flexibility: Bring your own API keys from OpenAI, Anthropic, Google, Mistral, or run fully local with Ollama. No vendor lock-in. - Enterprise-Grade Security: Fine-grained permissions, role-based access control, and data residency options to meet compliance requirements. - Agentic Workflow Automation: Build and deploy AI agents that automate tasks across your connected apps with transparent, auditable actions. - Confidence Scoring: Built-in confidence metrics with highlighted evidence and page-level references for every answer. - Multi-Format Support: Indexes and retrieves from PDF, DOCX, XLSX, CSV, TXT, MD, and email formats. PipesHub is open-source (Apache 2.0) and designed for self-hosting. It supports deployment on-premises, in private clouds, or on any infrastructure of your choice. The platform is containerized and includes comprehensive documentation for setup, configuration, and scaling. Ideal for enterprises prioritizing data sovereignty, compliance, and cost control.
Build and deploy enterprise-grade AI agents
Gemini Enterprise Agent Platform is Google Cloud's comprehensive platform for developers to build, scale, govern, and optimize enterprise-grade AI agents. It provides a single destination for technical teams to transform enterprise applications and workflows into powerful agentic systems. - Unified Agent Development: Build, scale, and govern AI agents with enterprise-grade tools - Model Selection: Access 200+ Google and third-party AI models including Gemini 3.5, Anthropic's Claude, and open models like Gemma - Model Customization: Train, test, and tune ML models with enterprise-grade evaluation tools - Workflow Orchestration: Deploy multiple agents to execute complex workflows like product launches - Governance & Security: Securely register, manage, and govern custom-built agents - Antigravity Integration: Centralized app for steering, customizing, and orchestrating agents - Production Deployment: Deploy models for production use with built-in scaling capabilities - Data Integration: Accelerate agent development with unified data and AI capabilities Gemini Enterprise Agent Platform is a fully managed cloud service provided by Google Cloud. It does not require self-hosting as it operates as a SaaS platform with enterprise-grade infrastructure, security, and compliance features. The platform is designed for global scale and includes built-in governance, security, and optimization tools. For developers looking to extend functionality, Google provides sample code, notebooks, and documentation through their GitHub repository (https://github.com/GoogleCloudPlatform/vertex-ai-samples/).
About Glean
Glean is an enterprise AI platform designed to connect your organization's data with intelligent agents, assistants, and search capabilities. Built for teams that need to find, create, and automate work while maintaining control over AI usage.
Key Features of Glean
- Enterprise Context: Ground AI in company data for accurate, relevant responses
- Glean Assistant: AI coworker for proactive insights, content creation, and multiplayer collaboration
- Glean Agents: Build, orchestrate, and govern AI agents with reusable libraries
- Enterprise Search: Find answers across all company systems and documents
- Glean Intelligence: Optimize AI requests and route work to appropriate models
- Glean Protect: Safely scale AI with security, governance, and usage controls
- 250+ Connectors: Integrate with existing enterprise tools and data sources
- APIs & Developer Tools: Build custom generative AI experiences and integrations
Tech / Self-Hosting
Glean is a cloud-native SaaS platform with enterprise-grade security and compliance. The platform offers APIs for custom integrations and provides governance controls for AI usage monitoring and cost management. While primarily cloud-based, Glean's architecture supports enterprise security requirements including SOC 2, GDPR, and HIPAA compliance.