A free and open-source software suite for high-performance molecular dynamics and output analysis.
New to GROMACS:
Try the introduction tutorial.
Watch a webinar on GROMACS.
Watch the current GROMACS release webinar.
Download the current GROMACS version here.
Have a look at documentation page to know more how to install and use GROMACS.
Do you have any questions, have a look at the user discussions on GROMACS forums.