# Technical repositories

The project stack is intentionally small and modular: a few core
libraries, a focused set of lighthouse applications, and a handful of
tools that unlock geometry handling, scalable discretization, and
workflow orchestration.

<div class="repo-intro">
Core libraries, lighthouse applications, and enabling tools behind dealii-X.
</div>

<div class="repo-grid">
  <a class="repo-card" href="libraries/index.html">
    <span class="repo-card__kicker">Libraries</span>
    <strong>Core numerical building blocks</strong>
    <span>deal.II, PSCToolkit, MUMPS</span>
  </a>
  <a class="repo-card" href="applications/index.html">
    <span class="repo-card__kicker">Applications</span>
    <strong>Digital twin demonstrators</strong>
    <span>Brain, heart, lungs, liver, mechanobiology</span>
  </a>
  <a class="repo-card" href="tools/index.html">
    <span class="repo-card__kicker">Tools</span>
    <strong>Meshing and polytopal workflows</strong>
    <span>Gmsh and Polydeal</span>
  </a>
  <a class="repo-card" href="user_interface/index.html">
    <span class="repo-card__kicker">Interface</span>
    <strong>Low-code orchestration</strong>
    <span>Node-based workflow authoring and HPC scheduling</span>
  </a>
</div>

```{toctree}
:hidden:
:maxdepth: 2

libraries/index
applications/index
tools/index
user_interface/index
```