OpenAI
Research and product lab behind ChatGPT, GPT-5, DALL-E, Sora, Codex, and the OpenAI API. Founded by Sam Altman, Greg Brockman, Ilya Sutskever, and others; deeply capitalised by Microsoft. Sets the pace on frontier LLMs for most of the industry.
60 tools in the directory
GPT-4o
FeaturedOpenAI's multimodal flagship behind ChatGPT.
Sora
FeaturedOpenAI's flagship text-to-video model.
DALL·E 3
OpenAI's image model — strong on prompt adherence and text-in-image.
Whisper
OpenAI's open-source speech-to-text — the de-facto baseline.
OpenAI Fine-tuning
Fine-tune GPT-4o-mini and friends on your own data.
Helicone
Open-source LLM observability — one-line proxy install.
LM Studio
Desktop app for discovering, downloading, and running open-weight LLMs locally with an OpenAI-compatible server.
Jan
Open-source desktop ChatGPT alternative that runs local LLMs and routes to cloud providers from one app.
LibreChat
Open-source, self-hostable ChatGPT-style frontend that brings every major LLM provider under one roof.
OpenAI Playground
OpenAI's official browser sandbox for prompting, tuning, and testing every model on the platform before you ship API code.
Poe
One subscription, every frontier model - Quora's multi-model chat hub with bots, image, video, and audio generation.
SGLang
Open-source high-throughput inference engine for LLMs and multimodal models with OpenAI-compatible serving.
Athina AI
Collaborative LLM evaluation and observability platform for teams shipping AI features to production.
Cube
Semantic layer that grounds LLM agents in your real business metrics instead of letting them hallucinate SQL.
Le Chat
Mistral's ChatGPT-style assistant, now an agent that browses, codes, and plugs into your work tools.
LocalAI
Self-hosted OpenAI-compatible API for running LLMs, image, and audio models on your own hardware.
NightCafe
Multi-model AI art generator with a heavy social-network bent and daily community challenges.
OpenAI Evals
OpenAI's open-source framework for benchmarking LLMs against a shared registry of evaluations.
PyGPT
Open-source desktop AI assistant that wires every major LLM provider into one local app with agents, vision, and a code interpreter.
CAMEL-AI
Open-source Python framework for building multi-agent systems and synthetic data pipelines.
ChatGPT
OpenAI's flagship conversational assistant, and the default benchmark every other chatbot is measured against.
NovelCrafter
Bring-your-own-key novel-writing workspace with a wiki-style codex and multi-model AI assistance.
pgMagic
Mac desktop client that lets you chat with your Postgres database in natural language using your own OpenAI key.
PromptHub
Git-style prompt management, testing, and deployment platform for teams running multiple LLMs in production.
Reflect
Networked note-taking app with GPT-4 and Whisper baked into the writing surface.
AnythingLLM
Open-source desktop and self-hosted app that turns your documents into a private chat-and-agent workspace.
LLM Stats
Live leaderboard and side-by-side comparison hub for 300+ frontier LLMs across reasoning, coding, and multimodal benchmarks.
PromptLayer
Lightweight prompt logging + management for OpenAI/Claude apps.
PromptHero
Searchable prompt library and image generator for Midjourney, Stable Diffusion, DALL-E and other image/video models.
Headroom
Open-source context compression layer that strips 70-95% of boilerplate before it hits your LLM.
Model Context Protocol
Open standard that lets AI apps plug into data sources, tools, and workflows like USB-C for LLMs.
OpenAI Swarm
Lightweight multi-agent orchestration in Python.
OpenCLI
Open-source bridge that hands your already-logged-in Chrome session to a CLI and AI agents.
Voicebox
Open-source desktop voice studio for local cloning, dictation, and giving MCP agents a voice.
AgentMemory
Open-source persistent memory runtime for AI coding agents, with hybrid retrieval and zero external dependencies.
Bifrost
Open-source AI gateway that unifies 1000+ models behind one OpenAI-compatible endpoint with failover, budgets, and MCP routing.
CAI
Open-source agent framework for offensive security, bug bounty automation, and AI-driven penetration testing.
Guizang PPT Skill
Claude Code / Codex agent skill that generates single-file HTML slide decks in editorial-magazine or Swiss-design styles.
Kong AI Gateway
Enterprise API gateway extended to route, govern, and observe LLM and agent traffic across providers.
OpenRouter
Unified API gateway to 400+ LLMs from 70+ providers, with one OpenAI-compatible endpoint and automatic failover.
AI-Flow
Visual node-based builder for chaining OpenAI, Anthropic, Replicate and other model APIs into content pipelines.
ChatGPT Shortcut
Curated, one-click prompt library covering ChatGPT, Claude, Gemini, and DeepSeek across writing, coding, and academic tasks.
Cherry Studio
Open-source desktop AI client that wires 300+ LLMs into one chat, knowledge-base, and agent workspace.
LLM by Datasette
A CLI and Python library for running prompts against any LLM provider and logging everything to SQLite.
Open Deep Research
Minimal open-source deep-research agent that iteratively searches, scrapes, and reasons to produce cited markdown reports.
Portkey AI Gateway
Open-source AI gateway that routes a single API call across 1,600+ LLMs with caching, fallbacks, and observability.
Promptfoo
Open-source eval and red-teaming framework for LLM apps, prompts, and RAG pipelines.
Vibe
Offline desktop transcription app powered by Whisper, with diarization, batch processing, and an HTTP API.
Craiyon
Free, no-login AI image generator that prioritises unlimited generations over fidelity.
Groq
Custom-silicon LPU inference platform serving open models at GPU-trouncing latency via an OpenAI-compatible API.
KNIME
Visual node-based data science platform with built-in connectors for OpenAI, Anthropic, Gemini, and local LLMs.
Manifest
Open-source LLM router that fans your agent traffic across providers and your existing AI subscriptions.
Oh My OpenAgent
Open-source multi-agent orchestration framework that coordinates specialized AI coders across planning, execution, and verification.
OpenArt
All-in-one AI canvas that bundles a dozen top image, video, and audio models behind a single subscription.
PandasAI
Conversational data analysis library that turns natural-language questions into pandas, SQL and chart code.
Portkey
Production LLM gateway with observability, guardrails, and prompt management for teams shipping AI in anger.
Prompt Foundry
Prompt management and side-by-side LLM evaluation for OpenAI and Anthropic models.
Respan (formerly Keywords AI)
LLM engineering platform combining a multi-model gateway with tracing, evals, and prompt management.
Scenario
Custom-trained generative AI platform for studios that need on-brand image, video, 3D, and audio assets at scale.
Serena
Open-source MCP toolkit that gives coding agents IDE-grade symbol search, refactoring, and editing across 40+ languages.