Best Alternatives to Vespa

Airweave is purpose-built for the agentic era: an open-source 'context retrieval layer' that sits between AI agents and the dozens of SaaS apps and databases where company knowledge actually lives. Slack threads, Notion docs, Linear tickets, Salesforce records, Postgres rows, Google Drive files, GitHub repos, Intercom conversations — Airweave handles ingestion, chunking, embedding, indexing, access control, and freshness for every connected source once, then exposes the unified context as a sing

Ducky is fully managed AI search and RAG infrastructure — chunking, embedding, hybrid retrieval, and reranking behind a single API. The pitch is to skip the Pinecone + Cohere + LangChain glue and get a tuned retrieval pipeline in one HTTP call.

Berlin-based search foundation: top-ranked multilingual embeddings, rerankers, a one-call Reader API, DeepSearch agent, small language models, and an official MCP server.

From Free

Agentic RAG-as-a-service from Progress: auto-indexes PDFs, audio, video, and databases into a Knowledge Box and serves grounded, cited answers — EU-hosted and multilingual.