You can use Google Cloud Platform or Amazon Web Services to perform MD simulations online. These platforms provide infrastructure and resources for scientific computing, including molecular dynamics simulations. You can set up your own computational environment and run simulations using software packages like GROMACS or AMBER. Additionally, you can use servers like Galaxy to perform simulations, which you can access by using the following link: https://usegalaxy-eu.github.io/index-cheminformatics.html