Best links with comments:

NEW! “Unblend colours”: find a colour that gives a given colour when mixed with a background colour.

Make a colour darker to compensate for transparency.

RGErun 2.2.3 , a completely reworked and simplified version of the Mathematica package for renormalization group running in effective field theories.

Mathematica function to draw mass spectra.

Notes on Feynman parametrization, and on the representations of the groups $\mathbb{Z}_2$, $\mathbb{Z}_3$ and $\mathbb{Z}_6$.

A new version of the colour blender with a sandbox.

Problems for natural science: what if … ?