> For the complete documentation index, see [llms.txt](https://docs.openg2p.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.openg2p.org/products/spar/development/technology-stack.md).

# Technology Stack

The following technologies and tools are used by SPAR.

| Technology             | Purpose                                                    | Version | License                                                           |
| ---------------------- | ---------------------------------------------------------- | ------- | ----------------------------------------------------------------- |
| Ubuntu Server          | Operating System (cluster nodes)                           | 22.04   | Free                                                              |
| Python                 | Development language                                       | 3.11    | [PSF License](https://docs.python.org/3/license.html#psf-license) |
| openg2p-fastapi-common | OpenG2P application framework (base for all SPAR services) |         | MPL 2.0                                                           |
| FastAPI                | REST API framework                                         |         | MIT                                                               |
| Pydantic               | Data validation & schemas                                  |         | MIT                                                               |
| SQLAlchemy             | ORM (async)                                                |         | MIT                                                               |
| Gunicorn               | Application server                                         | \~22.0  | MIT                                                               |
| Uvicorn                | ASGI worker                                                |         | BSD                                                               |
| PostgreSQL             | Database (shared `commons-postgresql`)                     |         | PostgreSQL License                                                |
| Keycloak               | Authentication — OIDC / OAuth2                             |         | Apache 2.0                                                        |
| Docker                 | Containerization                                           |         | Apache 2.0                                                        |
| Helm                   | Packaging & deployment                                     |         | Apache 2.0                                                        |
| Kubernetes             | Orchestration                                              |         | Apache 2.0                                                        |
| Istio                  | Service mesh / ingress                                     |         | Apache 2.0                                                        |
| Rancher                | Cluster management & catalog UI                            |         | Apache 2.0                                                        |
| Nginx                  | Web proxy / ingress                                        |         | BSD                                                               |
| Prometheus             | Monitoring                                                 |         | Apache 2.0                                                        |
| Grafana                | Monitoring dashboards                                      |         | AGPL 3.0                                                          |
| GitHub                 | Source code management                                     |         | Commercial (OpenG2P uses Free plan)                               |


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