Question: Can you recommend a personal information manager that allows me to retrieve and search stored data using semantic search ?

If you're in the market for a personal information manager with semantic search, myReach is a strong contender. It's got AI-powered search with natural language processing, automated tagging, and support for a variety of data sources like Google Drive and Bookmarks. It also has semantic search built in, which can help you find and analyze your data. With a range of pricing options including a free tier and strong security, myReach is a good choice for personal productivity and business use.

Another good option is Quivr, an open-source personal productivity assistant that uses AI to offer a single search engine for documents, tools and databases. It can integrate with a wide variety of file formats and apps, offering AI-based search that can incorporate your own data. Quivr is designed to protect privacy by processing data locally, so it's a good choice for personal use.

If you want to use AI on big data, Vespa is a unified search engine and vector database that can search vector, lexical and structured data. It's geared for large-scale machine-learned model inference, so it's good for search, recommendation and personalization tasks. Vespa has a free tier so developers can get started quickly with AI-powered search.