Top SEMANTIC GitHub Repositories & Tools (2026)

21 Lessons, Get Started Building with Generative AI

An open-source, local-first writing workspace where you can write with Claude Code and Codex, drawing on your own sources and past work.

XERJ is the new way for AI to search data. Its autoindex capability activates agents to know your data without the token waste of grep and sed. One command indexes code, docs, logs and PDFs for search, RAG, security audits and agent memory, using 40x fewer tokens than grep. Elasticsearch compatible, so existing clients just work.

A lightweight, lightning-fast, in-process vector database

grep, but the pattern is a description. Filters lines by meaning with TypeSafe's Jev decision model: ~200 ms and a thousandth of a cent per line.

Computer Vision Annotation Tool (CVAT) is a leading platform for building high-quality visual datasets for vision AI. It offers open-source, cloud, and enterprise products, as well as labeling services, for image, video, and 3D annotation with AI-assisted labeling, quality assurance, team collaboration, analytics, and developer APIs.

Open-source inference server and production cluster for all the models your agent needs.

The ultimate RAG for your monorepo. Query, understand, and edit multi-language codebases with the power of AI and knowledge graphs

📦🚀 Fully automated version management and package publishing

One Postgres for your application data, full-text search, vector retrieval, and aggregations. Home of the pg_search extension.

Graph-Native Infrastructure for Context and Accountable AI Systems

Code as configuration. Annotate a Java entity with @Erupt and ship a production-grade admin backend in minutes — UI, RBAC, audit logs and APIs, all generated at runtime. No codegen, no frontend.

The Semantic Intelligence Layer for Ontologies

Memory that AI Agents Love!

Open-source persistent memory for AI agent pipelines (LangGraph, CrewAI, AutoGen) and Claude. REST API + knowledge graph + autonomous consolidation.

Open-source semantic layer: one cube for Excel (MDX/XMLA), dashboards, and AI agents (MCP). Mondrian + Apache Calcite.

Open-source, self-hosted enterprise & site search server built on OpenSearch. Crawls web / file / DB / cloud sources, 20+ languages, REST API, and AI/RAG & semantic search. Apache-2.0.

Find code by asking what it does. A CLI for coding agents that uses Jev to discover relevant files and source context.

Video Search SDK for Android Kotlin. Integrate in any video app

Structural code intelligence for AI agents — semantic search, knowledge graphs, and a built-in MCP server in one Rust binary. Give Claude, Cursor, and any MCP client a deep understanding of your codebase.