Perplexity AI is the best AI search tool for intelligent information retrieval and is used by researchers and knowledge seekers.

LlamaIndex is a framework for building knowledge assistants using LLMs connected to enterprise data.

Elephas is an AI-powered knowledge assistant for Mac and iOS users.

Sana Agents is an AI agent and knowledge assistant for work, enabling users to chat, search, and interact with all their internal knowledge and meetings.

Briefy is an AI knowledge assistant that turns lengthy content (articles, videos, emails) into structured summaries and a searchable knowledge base for students and professionals.