Best Open Source copilot Libraries

#1x1xhlol/system-prompts-and-models-of-ai-tools

FULL Augment Code, Claude Code, Cluely, CodeBuddy, Comet, Cursor, Devin AI, Junie, Kiro, Leap.new, Lovable, Manus, NotionAI, Orchids.app, Perplexity, Poke, Qoder, Replit, Same.dev, Trae, Traycer AI, VSCode Agent, Warp.dev, Windsurf, Xcode, Z.ai Code, Dia & v0. (And other Open Sourced) System Prompts, Internal Tools & AI Models

#2github/spec-kit

💫 Toolkit to help you get started with Spec-Driven Development

#3dbeaver/dbeaver

Free universal database tool and SQL client

#4nextlevelbuilder/ui-ux-pro-max-skill

An AI SKILL that provide design intelligence for building professional UI/UX multiple platforms

#5chatboxai/chatbox

Powerful AI Client

#6CopilotKit/CopilotKit

The Frontend Stack for Agents & Generative UI. React + Angular. Makers of the AG-UI Protocol

#7voideditor/void

#8e2b-dev/awesome-ai-agents

A list of AI autonomous agents

#9rohitg00/agentmemory

#1 Persistent memory for AI coding agents based on real-world benchmarks

#10dice2o/BingGPT

Desktop application of new Bing's AI-powered chat (Windows, macOS and Linux)

#11assistant-ui/assistant-ui

Typescript/React Library for AI Chat💬🚀

#12lencx/Noi

🚀 Less chaos. More flow.

#13getpaseo/paseo

Orchestrate multiple coding agents from desktop and mobile

#14mksglu/context-mode

Privacy-first. MCP is the protocol for tool access. We're the virtualization layer for context.

#15github/gh-aw

GitHub Agentic Workflows

#16ant-design/x

Craft AI-driven interface effortlessly🤖

#17yvgude/lean-ctx

LeanCTX — the Context OS for AI development. One local binary that compresses, remembers, routes, and verifies every token between your code and the model. 63 MCP tools, 10 read modes, up to 99% token savings. Works with Cursor, Claude Code, Copilot, Windsurf, Codex, Gemini.

#18microsoft/intelligent-terminal

A fork of Windows Terminal with native agent integration, right in your command line.

#19aristoapp/awesome-second-brain

A curated solutions to building a self-evolving second brain that helps AI agents understand your personal and team context.

#20rcarmo/vibes

A simple mobile-focused chat app to talk to an agent via the ACP protocol

#21lidge-jun/cli-jaw

🦈 2-line install personal AI assistant. 11 AI runtime surfaces (Claude, Codex, Cursor, Gemini, Grok, Antigravity, OpenCode, Copilot), 200+ skills, zero ban risk.