PyMOL is a molecular visualization system maintained and distributed by Schrödinger. Built on an open-source foundation, it provides software for viewing and working with molecular structures. The project follows an open-source philosophy: most of its source code is freely available under a permissive license, while purchased licenses help fund ongoing maintenance and development. This approach reflects the vision of PyMOL’s original author, Warren L. DeLano, and supports open science.

PyMOL offers version 3.1 and the long-term-support 2.6 release, with downloadable packages for Windows, macOS, and Linux. Users can also install the software through the Schrödinger Anaconda channel. The site provides installation instructions, access to previous versions, license purchasing for new users, and license-file downloads for existing customers. Additional resources include screenshots, support, contact information, and links to the open-source project. PyMOL also invites users to become sponsors, connecting community support with the continued availability and development of this scientific visualization software.