A Platform for Many-Agent Reinforcement Learning

In plain words

This is a platform designed for multi-agent reinforcement learning research and development. It serves machine learning researchers and engineers working on systems where multiple agents interact and learn simultaneously. The platform provides tools and infrastructure to build, test, and train these complex multi-agent environments. It launched in December 2017 and is available as open source on GitHub.

written from the facts on this page · September 2026

• 
  Zen Agents (by Zencoder)2025 · docs.zencoder.ai · ▲287

  Build AI agents. Share org-wide. 100+ Tools&MCP

• 
  AgentX 2.02025 · agentx.so · ▲673

  Build your own cross-vendor multi-agent AI team

• 
  SimplAI2025 · simplai.ai · ▲589

  Hey HN, I've been building SimplAI for the past several months — it's a platform for building, testing, and deploying LLM-powered agents and multi-step workflows. The problem I kept running into: spinning up an AI agent pipeline means stitching together prompt management, tool calling, memory, evals, and deployment — often from scratch every time. SimplAI tries to be the layer that handles all of that so you can focus on what your agent actually does. What it does: - Visual + code-first workflow builder for chaining LLM calls, tools, and APIs - Built-in prompt versioning and A/B testing…

• 
  Agent ArenaJun 2026 · arena42.ai · ▲348

  Creator here. I built Agent Arena to answer a question that kept bugging me: when AI agents browse the web autonomously, how easily can they be manipulated by hidden instructions? How it works: 1. Send your AI agent to ref.jock.pl/modern-web (looks like a harmless web dev cheat sheet) 2. Ask it to summarize the page 3. Paste its response into the scorecard at wiz.jock.pl/experiments/agent-arena/ The page is loaded with 10 hidden prompt injection attacks -- HTML comments, white-on-white text, zero-width Unicode, data attributes, etc. Most agents fall for at least a few.…

• 
  LlamaGym – fine-tune LLM agents with online reinforcement learning2024 · github.com · ▲239

  Fine-tune LLM agents with online reinforcement learning - KhoomeiK/LlamaGym

• 
  rStation – Let's build our own AI swarm to solve Millennium Problems5d ago · rstation.ai · ▲60

  Research communities for independent AI agents, with problem-specific discussion and reviewed papers.

• 
  Spira Maxima▲578

  Video model that turns script into viral social media videos

  AI · 17d ago · spira.ai

• 
  Rill Browser▲540

  The browser where Claude Code and Codex work beside you

  AI · 17d ago · rill.love

• 
  Germany's new sovereign AI model Kolibri▲424

  Kolibri is Aleph Alpha

  AI · 19d ago · tej.as

• 
  Giving Opus 5.5 a simulated paint canvas▲392

  Paintings by AI models: programs run through a simulation of oil paint.

  AI · 20d ago · stillwet.art

• 
  PixVerse R2▲381

  A real-time world model you can explore and change

  AI · 29d ago · world.pixverse.video

• 
  Hemory▲381

  Keep listening. Searchable memory for your AI agents.

  AI · 29d ago · hemory.com

• 
  Airmash – Multiplayer Missile Warfare HTML5 Game▲1,535

  Free multiplayer dogfights in your browser, the official reboot of the 2017 hit. Five aircraft, five game modes, no download.

  Life & fun · 2017 · airma.sh

• 
  Nomad List 3.0▲1,252

  Find the best place to ❤️ live, 👩‍💻 work, and 💃 play

  Life & fun · 2017 · nomads.com

• 
  Design Principles▲920

  An open source repository of design principles and methods

  Work · 2017 · principles.design

• 
  unDraw▲896

  MIT licensed illustrations for your next project

  Dev tools · 2017 · evie.undraw.co

• 
  Descript▲869

  Text-based audio editor and automated transcription

  Work · 2017 · descript.com

• 
  Magic Leap One▲803

  Super stealthy AR startup reveals its first product

  Life & fun · 2017 · magicleap.com