CTK is an open-source C/C++ toolkit library for the Cell/B.E. processor. CTK is intended to accelerate Cell software development by providing various utility functions that most Cell programmers would need. CTK provides a set of common APIs for libspe, libspe2 and libspere (TOSHIBA's SPE library), and virtually enables "write-once, run everywhere" concept over several multiple Cell development environments. CTK also provides SPE Task runtime and library functions to facilitate more SPE-centric style programming, as utilizing SPEs is the key to increase performance in Cell/B.E. programming.