This program is developed in the group of Sjors H.W. Scheres at the MRC Laboratory of Molecular Biology,

- Sjors H.W. Scheres
- Shaoda He
- Takanori Nakane
- Jasenko Zivanov
- Liyi Dong

and Erik Lindahl at Stockholm University.

- Erik Lindahl
- Björn O. Forsberg
- Dari Kimanius

However, it does also contain pieces of code from the following packages:

- XMIPP by COS Sorzano et al: http:/xmipp.cnb.csic.es
- BSOFT by Heymann JB et al: http://lsbr.niams.nih.gov/bsoft/
- HEALPIX by NASA Jet Propulsion Laboratory: http://healpix.jpl.nasa.gov/
- libLBFGS by Naoaki Okazaki: http://www.chokkan.org/software/liblbfgs/
- Numerical diagonalization of 3x3 matrices by Joachim Kopp: https://www.mpi-hd.mpg.de/personalhomes/globes/3x3/index.html
- Gravis by Graphics and Vision Research Group at University of Basel: https://gravis.dmi.unibas.ch/index.html
- CPlot2D by Attila Michael Zsaki: http://www.amzsaki.com/?page_id=2073
- cmake-modules by Ryan A. Pavlik: https://github.com/rpavlik/cmake-modules
- Many contributions (especially RelionIt GUI) from Colin Palmer
- Symmetry relaxation patch by Vahid Abrishami 

Original disclaimers in the code of these external packages have been maintained as much as possible.
Please contact Sjors Scheres (scheres@mrc-lmb.cam.ac.uk) if you feel this has not been done correctly.

We also thank those who reported bugs and suggested fixes. They are acknowledged in the Git commit messages.