This project is a part of the larger X-ray tomographic reconstruction toolbox comprised of [flexDATA], [flexTOMO] and [flexCALC]. flexTOMO provides a wrapper around a GPU-based tomographic reconstruction toolbox ASTRA. The main purpose of this project is to provide an easy way to use cone-beam forward- and back-projectors. Another purpose is to collect various algebraic reconstruction algorithms, providing support for large disk-mapped arrrays (memmaps) and subsets that allow to both accelerate convergence and to save RAM.