The CASTEP code is available under a free of charge license to all UK academic research groups under the terms of an agreement between STFC, University of York (for UKCP) and Accelrys Inc. To sign up for a UK academic license please download the three license forms and follow the instructions.
For registered users the source code, executables etc are available on CCPForge. This also has a facility to request features and track bugs.
A source code license is available for European Academics. The cost is €1800. To purchase a copy or for further information contact Accelrys via the "contact us" button on the following website.
Under the CASTEP Source Code License Agreement, research teams under the supervision of a Professor or Principal Investigator at qualifying European Academic Institutions have access to the source code for CASTEP. Binary executables are not included but instructions are provided to enable compilation of the source code. Support queries regarding CASTEP Source Code should go via the CASTEP mailing list.
Industry and Rest of World
CASTEP may be purchased as part of the Materials Studio software from Accelrys.