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Alternatives

Products that do what Ragdoll Studio (fka Arthas.AI) is the FOSS alternative to character.ai does

  1. 1

    Unlock AI magic for elevated customer engagement, fast

    2023 · tiledesk.com

  2. 2AO

    Hey HN! This is Tim from AnythingLLM (https://github.com/Mintplex-Labs/anything-llm). AnythingLLM is an open-source desktop assistant that brings together RAG (Retrieval-Augmented Generation), agents, embeddings, vector databases, and more—all in one seamless package. We built AnythingLLM over the last year iterating and iterating from user feedback. Our primary mission is to enable people with a layperson understanding of AI to be able to use AI with little to no setup for either themselves, their jobs, or just to try out using AI as an assistant but with *privacy by…

    2024 · github.com

  3. 3
    Humaaans1,592

    Mix-&-match illustrations of humans with a design library.

    2018 · humaaans.com

  4. 4AA
  5. 5

    Transform character designs in real-time with AI

    2024

  6. 6

    Entertain, create, earn - the ultimate AI character platform

    2023

  7. 7
    Powabase419

    Build AI apps with Postgres, RAG, and agents

    May 2026 · powabase.ai

  8. 8
    Agenta362

    Open-source prompt management & evals for AI teams

    Nov 2025

  9. 9JA

    Hello HN, I don't post on here much, but wanted to get some eyes on a new project I'm just launching. I think we definitely need one more AI code agent.. I'm a long-term C++ dev, and over 30+ years I've created some successful audio dev tools (JUCE, the Tracktion DAW, the Cmajor DSP language). All of these came from me getting annoyed with something I had to use, and deciding to have a go at my own take on whatever it was. So Juggler is my attempt at an AI code agent, after spending too many hours loving what the models could do, but hating the CLI experience, and having some opinions of…

    Jul 2026 · github.com

  10. 10
    Ragie299

    Fully managed RAG-as-a-Service for developers

    2024

  11. 11
    Tila AI636

    Create, code, search + design AI content all in one canvas

    2025 · tila.ai

  12. 12
    LLMWare358

    Dev tool to make AI apps to deploy privately or locally

    2024

  13. 13
    RAGaaS75

    The API for building production-ready AI apps with your data

    2025

  14. 14AT

    Hi HN community! We want to share AI-town, a deployable starter kit for building and customizing your own version of AI simulation - a virtual town where AI characters live, chat and socialize. Inspired by great work from the Stanford Generative Agent paper (https://arxiv.org/abs/2304.03442). A few features: - Includes a convex.dev backed server-side game engine that handles global state - Multiplayer ready. Deployment ready - 100% Typescript - Easily customizable. You can fork it, change character memories, add new sprites/tiles and you have a custom AI simulation…

    2023 · github.com

  15. 15IM

    Modd.io is a collaborative game editor that runs in browser. It's kind of like Figma for game dev. We made this engine low-code and multiplayer-first, so developeres can quickly prototype casual multiplayer games. I hope some of you guys will find this useful. Would love to hear feedback also. Thank you. Engine Demo: https://www.modd.io

    2023 · github.com

  16. 16

    Bring your AI avatars to life with your own unique branding

    2025

  17. 17TA

    I built this tool because I wanted a way to just take a bunch of URLs or domains, and query their content in RAG applications. It takes away the pain of crawling, extracting content, chunking, vectorizing, and updating periodically. I'm curious to see if it can be useful to others. I meant to launch this six months ago but life got in the way...

    2024 · embedding.io

  18. 18

    Open-source web UI to run and train AI models.

    Mar 2026

  19. 19HW

    TL;DR: Vector-based RAG performs poorly for many real-world applications like codebase chats, and you should consider 'language maps'. Part of our mission at Mutable.ai is to make it much easier for developers to build and understand software. One of the natural ways to do this is to create a codebase chat, that answer questions about your repo and help you build features. It might seem simple to plug in your codebase into a state-of-the-art LLM, but LLMs have two limitations that make human-level assistance with code difficult: 1. They currently have context windows that are too small to…

    2024 · twitter.com

  20. 20RO

    Ragas is an open-source library for evaluating and testing RAG and other LLM applications. Github: https://docs.ragas.io/en/stable/, docs: https://docs.ragas.io/. Ragas provides you with different sets of metrics and methods like synthetic test data generation to help you evaluate your RAG applications. Ragas started off by scratching our own itch for evaluating our RAG chatbots last year. Problems Ragas can solve - How do you choose the best components for your RAG, such as the retriever, reranker, and LLM? - How do you formulate a test dataset…

    2024 · github.com

  21. 21
    Voila141

    Open-source AI for real-time, expressive voice role-play

    2025

  22. 22AA

    Hey HN, I wanted to share a new project we've been working on for the last couple of months called ART (https://github.com/OpenPipe/ART). ART is a new open-source framework for training agents using reinforcement learning (RL). RL allows you to train an agent to perform better at any task whose outcome can be measured and quantified. There are many excellent projects focused on training LLMs with RL, such as GRPOTrainer (https://huggingface.co/docs/trl/main/en/grpo_trainer) and verl…

    2025 · github.com

  23. 23
    Super RAG114

    Super performant RAG pipelines for AI apps

    2024

  24. 24

    Opensource Low code RAG Builder

    2024

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