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Meta Experimental

These are Meta projects that are not necessarily used in production but are being developed in the open nevertheless.

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  1. Recoil Recoil Public archive

    Recoil is an experimental state management library for React apps. It provides several capabilities that are difficult to achieve with React alone, while being compatible with the newest features o…

    JavaScript 19.6k 1.2k

  2. libunifex libunifex Public

    Unified Executors

    C++ 1.7k 205

  3. Robyn Robyn Public

    Robyn is an experimental, AI/ML-powered and open sourced Marketing Mix Modeling (MMM) package from Meta Marketing Science. Our mission is to democratise modeling knowledge, inspire the industry thr…

    Jupyter Notebook 1.4k 417

  4. hermit hermit Public

    Hermit launches linux x86_64 programs in a special, hermetically isolated sandbox to control their execution. Hermit translates normal, nondeterministic behavior, into deterministic, repeatable beh…

    Rust 1.3k 42

  5. MIRAI MIRAI Public archive

    Rust mid-level IR Abstract Interpreter

    Rust 1k 83

  6. reverie reverie Public

    An ergonomic and safe syscall interception framework for Linux.

    Rust 806 35

Repositories

Showing 10 of 43 repositories
  • free-threading-benchmarking Public

    Benchmark results for free-threaded builds of Python

    facebookexperimental/free-threading-benchmarking’s past year of commit activity
    27 BSD-3-Clause 5 2 0 Updated Jan 6, 2026
  • moxygen Public

    Implementation of IETF MOQ protocol

    facebookexperimental/moxygen’s past year of commit activity
    C++ 89 MIT 19 7 5 Updated Jan 6, 2026
  • triton Public

    Github mirror of trition-lang/triton repo.

    facebookexperimental/triton’s past year of commit activity
    MLIR 114 MIT 32 3 49 Updated Jan 6, 2026
  • rust-shed Public

    Repository containing Rust crates common between other Facebook open source projects (like Mononoke or Eden).

    facebookexperimental/rust-shed’s past year of commit activity
    Rust 142 Apache-2.0 45 0 2 Updated Jan 5, 2026
  • edencommon Public

    Shared library for Watchman and Eden projects.

    facebookexperimental/edencommon’s past year of commit activity
    C++ 13 MIT 17 2 0 Updated Jan 5, 2026
  • hermit Public

    Hermit launches linux x86_64 programs in a special, hermetically isolated sandbox to control their execution. Hermit translates normal, nondeterministic behavior, into deterministic, repeatable behavior. This can be used for various applications, including replay-debugging, reproducible artifacts, chaos mode concurrency testing and bug analysis.

    facebookexperimental/hermit’s past year of commit activity
    Rust 1,334 42 21 3 Updated Jan 2, 2026
  • siMMMulator Public

    siMMMulator is an open source R-package that helps users to generate simulated data to plug into Marketing Mix Models (MMMs). The package features a variety of functions to help users build a data set from scratch.

    facebookexperimental/siMMMulator’s past year of commit activity
    R 58 14 4 5 Updated Dec 30, 2025
  • semcode Public

    semcode

    facebookexperimental/semcode’s past year of commit activity
    Rust 40 Apache-2.0 10 1 1 Updated Dec 26, 2025
  • libunifex Public

    Unified Executors

    facebookexperimental/libunifex’s past year of commit activity
    C++ 1,676 205 90 (5 issues need help) 14 Updated Dec 19, 2025
  • reverie Public

    An ergonomic and safe syscall interception framework for Linux.

    facebookexperimental/reverie’s past year of commit activity
    Rust 806 35 2 0 Updated Dec 18, 2025
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