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</head>
<body>
<header>
<div class="nav-row">
<div class="wordmark"><span class="dot"></span>OpenSysML</div>
<nav class="links">
<a href="#stack">The stack</a>
<a href="#ecosystem">Ecosystem</a>
<a href="https://github.com/Open-MBEE">GitHub</a>
</nav>
</div>
</header>
<section class="hero">
<div class="grid-bg"></div>
<div class="wrap hero-inner">
<div class="kicker"><span class="rule"></span>OPEN SOURCE · SYSML V2 · KERML</div>
<h1 class="headline">Open source finally speaks SysML v2.</h1>
<p class="sub">Three independently built implementations of the OMG standard — a Go runtime, a Rust toolchain, and OMG's own reference build — reading and writing the same models, with an open, version-controlled store underneath to hold what they produce. No seat licenses. No vendor lock-in. Clone it, build it, run it today.</p>
<div class="cta-row">
<a class="btn btn-primary" href="https://github.com/Open-MBEE">Browse the repos</a>
<a class="btn btn-secondary" href="https://www.omg.org/sysml/">Read the spec</a>
<a class="btn btn-secondary" href="https://github.com/Open-MBEE/open-mbee.github.io/wiki/Participate-in-OpenMBEE-and-OpenSysML">Join the community</a>
</div>
</div>
<div class="wrap diagram-shell">
<svg id="schematic" viewBox="0 0 900 460" xmlns="http://www.w3.org/2000/svg" role="img" aria-label="Diagram showing Flexo MMS at the center, connected to the OpenSysML REDK, sysml-toolkit, and the SysML v2 Pilot Implementation">
<!-- wires -->
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<path class="wire w2" d="M450,255 C520,190 600,150 690,120" />
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<text class="node-sub" x="450" y="270" text-anchor="middle" font-size="11">the model store</text>
<!-- node: OpenSysML REDK -->
<rect class="node-box" x="40" y="46" width="340" height="88" />
<text class="node-label" x="210" y="74" text-anchor="middle" font-size="15">OpenSysML REDK</text>
<text class="node-sub" x="210" y="92" text-anchor="middle" font-size="11">Runtime Environment and Development Kit</text>
<text class="node-sub" x="210" y="107" text-anchor="middle" font-size="11">Go · runtime + LSP + REPL</text>
<text class="node-sub" x="210" y="122" text-anchor="middle" font-size="10">Python · Node · Java · Rust · Julia · MATLAB · Jupyter</text>
<!-- node: sysml-toolkit -->
<rect class="node-box" x="600" y="70" width="180" height="60" />
<text class="node-label" x="690" y="95" text-anchor="middle" font-size="15">sysml-toolkit</text>
<text class="node-sub" x="690" y="115" text-anchor="middle" font-size="11">Rust · toolchain + LSP</text>
<!-- node: Pilot Implementation -->
<rect class="node-box" x="330" y="395" width="240" height="60" />
<text class="node-label" x="450" y="418" text-anchor="middle" font-size="14">SysML v2 Pilot Implementation</text>
<text class="node-sub" x="450" y="438" text-anchor="middle" font-size="11">OMG reference · Java / Xtext</text>
</svg>
</div>
</section>
<section class="stats">
<div class="wrap">
<h3 class="license-heading">Licensing</h3>
<ul class="license-list">
<li>The OpenSysML stack uses a dual-license model: <b>Apache-2.0</b> for code and <b>CC BY 4.0</b> for wiki text, diagrams, and other written content.</li>
<li>The one exception is the OMG reference implementation, which is licensed <b>EPL-2.0</b> rather than Apache-2.0.</li>
<li>See the stack below for the specific license per project.</li>
</ul>
</div>
</section>
<section class="section" id="stack">
<div class="wrap">
<div class="section-head">
<h2>The stack</h2>
<p>Four projects, independently maintained, built against the same open interfaces — a runtime, a toolchain, the reference implementation itself, and a model store to tie them together.</p>
</div>
<div class="stack-grid">
<div class="spec-card">
<span class="corner tl"></span><span class="corner tr"></span><span class="corner bl"></span><span class="corner br"></span>
<div class="spec-path">Open-MBEE / OpenSysML Runtime Environment and Development Kit</div>
<h3>OpenSysML REDK</h3>
<div class="spec-role">Runtime Environment and Development Kit · the runtime</div>
<p class="spec-desc">A complete SysML v2 and KerML implementation in Go — language server, interactive REPL, and an execution runtime that instantiates parts, evaluates constraints, and runs action and state behavior on a clock, not just validates them. Ships with Python, Node, Java, Rust, Julia and MATLAB clients over gRPC, a Jupyter kernel, and VS Code, SysON and MDK plugins.</p>
<div class="spec-meta">
<span><b>Go</b></span>
<span>Apache-2.0</span>
<span>★ 8</span>
</div>
<a class="spec-link" href="https://opensysml.opensysml.org/">Site</a>
<a class="spec-link" href="https://github.com/Open-MBEE/OpenSysML" style="margin-left:18px;">View on GitHub</a>
<a class="spec-link" href="https://opensysml.opensysml.org/guide/04-repl/" style="margin-left:18px;">Try the Runtime</a>
</div>
<div class="spec-card">
<span class="corner tl"></span><span class="corner tr"></span><span class="corner bl"></span><span class="corner br"></span>
<div class="spec-path">Open-MBEE / sysml-toolkit</div>
<h3>sysml-toolkit</h3>
<div class="spec-role">The tool kit</div>
<p class="spec-desc">A Rust workspace covering parsing, formatting, linting, JSON/CBOR interchange, constraint solving, and span-preserving model transformation, plus a language server and Python and WebAssembly bindings. Built for programmatic pipelines and CI, not just editing.</p>
<div class="spec-meta">
<span><b>Rust</b></span>
<span>Apache-2.0</span>
<span>★ 4</span>
</div>
<a class="spec-link" href="https://github.com/Open-MBEE/sysml-toolkit">View on GitHub</a>
</div>
<div class="spec-card">
<span class="corner tl"></span><span class="corner tr"></span><span class="corner bl"></span><span class="corner br"></span>
<div class="spec-path">Systems-Modeling / SysML-v2-Pilot-Implementation</div>
<h3>SysML v2 Pilot Implementation</h3>
<div class="spec-role">The reference</div>
<p class="spec-desc">The OMG Systems Modeling Community's own implementation — Eclipse Xtext editors, PlantUML visualization, and a Jupyter kernel. Both projects above track its grammar and standard library as their conformance baseline; this is the ground truth.</p>
<div class="spec-meta">
<span><b>Java / Xtext</b></span>
<span>EPL-2.0</span>
<span>★ 253</span>
</div>
<a class="spec-link" href="https://github.com/Systems-Modeling/SysML-v2-Pilot-Implementation">View on GitHub</a>
</div>
<div class="spec-card hub-card">
<span class="corner tl"></span><span class="corner tr"></span><span class="corner bl"></span><span class="corner br"></span>
<div class="spec-path">Open-MBEE / flexo-mms-*</div>
<h3>Flexo MMS</h3>
<div class="spec-role">The model store</div>
<p class="spec-desc">A collection of microservices forming a version-controlled home for model data whose native form is RDF — a model is a graph other tools can query, diff, and merge, not a file they have to reparse. One SPARQL 1.1 quadstore underneath, JSON Web Tokens between services, and a SysML v2 API layer built on top of it, so it plugs into the same open interchange the tools above already speak.</p>
<div class="spec-meta">
<span><b>Kotlin / Scala</b></span>
<span>Apache-2.0</span>
<span>multiple services</span>
</div>
<a class="spec-link" href="https://github.com/Open-MBEE/flexo-mms.openmbee.org">View on GitHub</a>
</div>
</div>
</div>
</section>
<section class="section" id="ecosystem">
<div class="wrap">
<div class="section-head">
<h2>The wider ecosystem</h2>
<p>OpenSysML isn't a single product — it's a stack plus the people, standards bodies, and growing library ecosystem around it.</p>
</div>
<div class="eco-grid">
<div class="eco-card">
<span class="corner tl"></span><span class="corner tr"></span><span class="corner bl"></span><span class="corner br"></span>
<div class="eco-tag">Docs · CC BY 4.0</div>
<h4>OpenSysML Wiki</h4>
<p>Guides, decisions, and working notes for the project — the place to read up before digging into any one tool in the stack. Content is CC BY 4.0, separate from the code licenses above.</p>
<a class="eco-link" href="https://github.com/Open-MBEE/opensysml.github.io/wiki">Read the wiki</a>
</div>
<div class="eco-card">
<span class="corner tl"></span><span class="corner tr"></span><span class="corner bl"></span><span class="corner br"></span>
<div class="eco-tag">Standards body</div>
<h4>OMG SysML</h4>
<p>The Object Management Group's home for the SysML specification itself — the standard that every project in the stack implements.</p>
<a class="eco-link" href="https://www.omg.org/spec/SysML">Visit OMG SysML</a>
</div>
<div class="eco-card">
<span class="corner tl"></span><span class="corner tr"></span><span class="corner bl"></span><span class="corner br"></span>
<div class="eco-tag">Standards body</div>
<h4>INCOSE</h4>
<p>The International Council on Systems Engineering — the professional society behind much of the practice and methodology SysML v2 is built to support.</p>
<a class="eco-link" href="https://www.incose.org">Visit INCOSE</a>
</div>
<div class="eco-card">
<span class="corner tl"></span><span class="corner tr"></span><span class="corner bl"></span><span class="corner br"></span>
<div class="eco-tag">Parent community</div>
<h4>OpenMBEE</h4>
<p>The Open Model-Based Engineering Environment — open-source tooling for managing, integrating, and publishing systems models at scale, and the broader community OpenSysML grew out of.</p>
<a class="eco-link" href="https://www.openmbee.org">Visit OpenMBEE</a>
</div>
<div class="eco-card pending">
<span class="corner tl"></span><span class="corner tr"></span><span class="corner bl"></span><span class="corner br"></span>
<div class="eco-tag">Growing</div>
<h4>Libraries built on OpenSysML</h4>
<p>Parsers, exporters, editor integrations, and other open-source libraries built around SysML v2. Reach out through the wiki to get yours listed as this space grows.</p>
<a class="eco-link" href="https://github.com/Open-MBEE/opensysml.github.io/wiki">See what's listed so far</a>
</div>
<div class="eco-card">
<span class="corner tl"></span><span class="corner tr"></span><span class="corner bl"></span><span class="corner br"></span>
<div class="eco-tag">Project</div>
<h4>OpenSysML REDK</h4>
<p>Where the runtime is built: the documentation site with the handbook, CLI/REPL reference and measured compliance status, and the Open-MBEE/OpenSysML repository — issue forms for tool bugs, specification gaps and ruling objections, and GitHub Discussions for questions and ideas.</p>
<a class="eco-link" href="https://opensysml.opensysml.org/">Site</a>
<a class="eco-link" href="https://github.com/Open-MBEE/OpenSysML/issues/new/choose" style="margin-left:18px;">Open an issue</a>
<a class="eco-link" href="https://github.com/Open-MBEE/OpenSysML/discussions" style="margin-left:18px;">Discussions</a>
</div>
</div>
</div>
</section>
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<div class="footer-top">
<h3>Pick a project, clone it, and start modeling.</h3>
<a class="btn btn-primary" href="https://github.com/Open-MBEE">Browse Open-MBEE on GitHub</a>
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<div class="footer-links">
<a href="https://www.openmbee.org/">openmbee.org</a>
<a href="https://www.opensysml.org/">opensysml.org</a>
<a href="https://www.omg.org/sysml/">OMG SysML</a>
<a href="https://www.incose.org/">INCOSE</a>
<a href="https://numfocus.org/">NumFOCUS</a>
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<span>OpenSysML · MBSE / SysML v2 ecosystem</span>
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<p class="license-note"><b>Code is Apache-2.0 / EPL-2.0</b> (per project, above). <b>Wiki text, diagrams, and other written content on this page are licensed CC BY 4.0</b> — reuse and adapt freely, with attribution.</p>
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