Best Open Source Alternatives to Perplexity

Self-hosted AI answering engine with privacy, local LLM support, and cited sources.

Open-source autonomous AI agent for deep web and local research with citations.

Open source AI research agent CLI for literature reviews, paper audits, and deep research workflows.

Open-source, local-first AI research workbench with agents, MCP tools, and Python/R execution for reproducible science.

Open-source deep research tool using any LLM, with SSE API and MCP server support.

Deep research skill for Claude Code and Codex that builds a persistent, searchable research vault.