I believe that the only bundled layout is a force atlas 2 force-directed.<p><a href="https:&#x2F;&#x2F;github.com&#x2F;jacomyal&#x2F;sigma.js&#x2F;tree&#x2F;master&#x2F;plugins" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;jacomyal&#x2F;sigma.js&#x2F;tree&#x2F;master&#x2F;plugins</a><p>It does look like it should be reasonable to add in any custom layouts though.