Alternatives to Corpusos

pgvector brings open-source vector similarity search to Postgres so embeddings live next to your relational data.

Open-source RAG engine with built-in ETL, hybrid vector/BM25 search and visual agent orchestration for enterprise AI agents.

Milvus is an open-source vector database for billion-scale similarity search, hybrid retrieval, and lake-native RAG workloads

Open-source Microsoft Research RAG that builds a knowledge graph and community summaries from your documents, then queries them in four modes.

Vespa is an open-source AI search platform for hybrid vector, text, and tensor retrieval with machine-learned ranking.

Open-source, self-hosted agentic data assistant that connects to your databases, writes SQL and code, and runs analysis in sandboxes

Vespa AI is an open-source AI search platform for hybrid vector, text and structured retrieval with ML ranking in one query pass.

Microsoft's open-source, code-first Python framework for building stateful, data-intensive conversational AI agents.

Apache Doris unifies OLAP analytics, full-text search, and vector search in one open-source SQL engine.

Open-source agent platform that fuses knowledge graphs with RAG for self-hosted, explainable enterprise AI.

Databend is an open-source, cloud-native data warehouse in Rust that runs BI analytics, vector search, full-text search and geospatial on

Open-source in-process vector database from Alibaba — install one Python package, query millions of vectors in seconds.

Xberg is an open-source content intelligence engine that extracts 107 document, web, code, image and audio formats into clean Markdown,

Free, open-source Python framework for extracting structured data from documents using LLMs and decision models with minimal code

AI-native graph database running vector similarity and OpenCypher traversal in one query for GraphRAG pipelines.

OpenAgents is an open-source language agent platform for data analysis, 200+ plugins and autonomous web browsing.

Open source AI engineering platform for agent and LLM tracing, evaluation, prompt management, and ML lifecycle work.

Open-source AI coworker workspace that builds, schedules and ships agents to Slack or Telegram

Open-source AI observability for agent tracing, LLM-as-a-judge evals, and coding-agent cost tracking.

LanceDB is an open-source multimodal lakehouse that keeps curation, feature engineering, hybrid search, and training on one Lance table.

Agno is an open-source Python SDK and AgentOS runtime for building and self-hosting an agent platform with REST API and MCP server.

Lance is an open lakehouse format for multimodal AI, pairing a file format, table format, and catalog spec with hybrid vector and full-text search on object

Open-source CLI that turns 18 source types into AI skills and RAG knowledge for 22 AI platforms.

Open-source Python framework that incrementally keeps AI agent context fresh by reprocessing only changed data.

spaCy is the open-source Python NLP library for fast, production-grade text processing and information extraction at scale.

Open-source Ruby gem that calls 11 LLM providers through one consistent interface for embeddings, completions, and chat.

Open-source Django library for adding LLM assistants, chat, RAG, and Tool Calling to your existing app

NodeDB is a universal database engine that unifies vector, graph, document, columnar, key-value, full-text, sparse arrays, and CRDT in one binary over plain

OpenCrab turns your documents into versioned ontology knowledge packs that Claude, ChatGPT, Cursor and Codex query through one MCP URL.

Open-source context retrieval layer that syncs your apps and databases so AI agents query live business data in natural language.