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.
Nine projects built around open interfaces — a runtime, a toolchain, the reference implementation, a model store, and SDKs, bridges, and web tools that connect them to applications.
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 Cameo plugins.
Site View on GitHub Try the RuntimeA Rust toolchain for SysML v2 and KerML covering parsing, formatting, linting, and conversion between textual models and JSON/CBOR interchange. Validates model structure, references, and semantic constraints; evaluates expressions, calculations, and quantities with exact arithmetic and unit conversion; and verifies constraints with satisfied, violated, or undecided verdicts, backed by Z3 or interval solving. Includes span-preserving model transformation, a language server, and Python and WebAssembly bindings for programmatic pipelines and CI.
View on GitHubThe 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.
View on GitHubA 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.
View on GitHubRead SysML v2 and KerML models from Python, JavaScript/TypeScript, Java, C#, and C++ through classes, properties, and operations shaped by the OMG metamodels. Builds on sysml-toolkit for reading textual models, resolving names, and evaluating model operations, with a separate JSON payload backend for reading model exports without native code.
View on GitHubConnects sysml-toolkit to Flexo MMS through sysmlv2-python-client, bringing the toolchain and the model store together. Uses sysml-toolkit as its language tooling foundation and the Python client for access to the model store.
View on GitHubA Python client for the OMG Systems Modeling API and Services, tested against OpenMBEE Flexo. Provides project, commit, branch, tag, element, and relationship operations with bearer-token authentication and API error handling. Connects flexo-sysml-toolkit to Flexo MMS in the stack above.
View on GitHubA web service for graphical SysML v2 views and textual model editing against a SysML v2 API backend such as Flexo MMS. Uses the SysML v2 Pilot Implementation for graphical rendering, textual parsing, and validation. Browse models and commit changes through a browser, with standalone deployment or embedding in JupyterLab and server-side access to the model backend.
View on GitHubA bridge for Cameo and the Model Context Protocol (MCP), built on both OpenSysML MDK and sysml-toolkit. Connects Cameo integration with the runtime and language tooling in the OpenSysML stack.
View on GitHubOpenSysML isn't a single product — it's a stack plus the people, standards bodies, and growing library ecosystem around it.
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.
Read the wikiThe Object Management Group's home for the SysML specification itself — the standard that every project in the stack implements.
Visit OMG SysMLThe International Council on Systems Engineering — the professional society behind much of the practice and methodology SysML v2 is built to support.
Visit INCOSEThe 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.
Visit OpenMBEEParsers, 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.
See what's listed so farWhere 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.
Site Open an issue Discussions