# Applications

The application layer turns the shared numerical stack into concrete
digital twin demonstrators for organs and cellular-scale models.

<div class="repo-grid">
  <a class="repo-card" href="brain.html">
    <span class="repo-card__kicker">Brain</span>
    <strong>ExaBrain</strong>
    <span>Scalable tissue mechanics and inversion workflows</span>
  </a>
  <a class="repo-card" href="heart.html">
    <span class="repo-card__kicker">Heart</span>
    <strong>lifeX</strong>
    <span>Cardiac multiphysics on top of deal.II</span>
  </a>
  <a class="repo-card" href="lungs.html">
    <span class="repo-card__kicker">Lungs</span>
    <strong>ExaDG</strong>
    <span>High-order DG flow and transport solvers</span>
  </a>
  <a class="repo-card" href="liver.html">
    <span class="repo-card__kicker">Liver</span>
    <strong>ImmersX</strong>
    <span>Embedded and mixed-dimensional vascular workflows</span>
  </a>
  <a class="repo-card" href="mechanobiology.html">
    <span class="repo-card__kicker">Mechanobiology</span>
    <strong>m4code</strong>
    <span>Cell motility, membrane transport, and receptor relocation</span>
  </a>
</div>

```{toctree}
:hidden:
:maxdepth: 1

brain
heart
lungs
liver
mechanobiology
```