  The program package XLOOPS calculates massive one- and two-loop Feynman
diagrams. It consists of five parts:
  i) a graphical user interface
  ii) routines for generating diagrams from particle input
  iii) procedures for calculating one-loop integrals both analytically and
numerically
  iv) routines for massive two-loop integrals
  v) programs for numerical integration of two-loop diagrams. The package
relies on the application of parallel space techniques. The treatment of tensor
structure and the separation of UV and IR divergences in analytic expressions
is described in this scheme. All analytic calculations are performed with
MAPLE. Two-loop examples taken from Standard Model calculations are presented.
The method has recently been extended to all two-loop vertex topologies,
including the crossed topology, graphs with divergent subloops and IR divergent
diagrams. This will be included in the XLOOPS package in the near future.
