  TC++ is a free/libre open-source software of the transcorrelated (TC) method
for first-principles calculation of solids. Here, the TC method is one of the
promising wave-function theories that can be applied to periodic systems with
reasonable computational cost and satisfactory accuracy. We present our
implementation of TC++ including a detailed description of the divergence
correction technique applied to the TC effective interactions. We also present
the way to use TC++ and some results of application to simple periodic systems:
bulk silicon and homogeneous electron gas.
