  The critical $O(N)$ CFT in spacetime dimensions $2 < d < 4$ is one of the
most important examples of a conformal field theory, with the Ising CFT at
$N=1$, $2 \leq d < 4$, as a notable special case. Apart from numerous physical
applications, it serves frequently as a concrete testing ground for new
approaches and techniques based on conformal symmetry. In the perturbative
limits - the $4-\varepsilon$ expansion, the large $N$ expansion and the
$2+\tilde\epsilon$ expansion - a lot of conformal data have been computed over
the years. In this report, we give an overview of the critical $O(N)$ CFT,
including some methods to study it, and present a large collection of conformal
data. The data, extracted from the literature and supplemented by many
additional computations of order $\varepsilon$ anomalous dimensions, are made
available through an ancillary data file.
