THELI is the almost fully automatic image reduction pipeline developed for the Garching-Bonn Deep Survey (GaBoDS). It is an instrument independent pipeline that is known to work on a variety of cameras (single- and multi-chip) from the U- to the K-band. The pipeline (without near-infrared and absolute photometric calibrations modules) is described in detail in Erben et al. (2005, Astronomische Nachrichten 326, 432–464). The absolute photometry is described in Hildebrandt et al. (2006, A&A 452, 1121–1128).
The pipeline is freely available from its official web site via the link on the left. The public pipeline release does not contain the absolute photometry module at the moment. Feel free to contact me if you are interested in this.