The galrep package provides a Magma implementation of the algorithms described in the paper:
Andrew V. Sutherland, Computing images of Galois representations attached to elliptic curves, Forum of Mathematics, Sigma 4 (2016), e4, 79 pages.You are welcome to use and/or modify this software in your research provided you cite the papers above if/when you publish your work.
Download link: galrep.tar (90KB)