DesertSci has recently extended the capability of Proasis4 to more easily compare the binding of two closely related ligands in the same binding site.
You can now compare two identical modelled conformations differing by protonation state, or two different conformations of the same modelled ligand. Proasis4 then allows any experimental structure to be easily retrieved and overlayed onto these modelled structures.
We have also made it more convenient to dynamically add new structures into a saved session for a project, and then save and share with other colleagues. This means more new ideas from project meetings can be saved and shared with all members of the project team.
For MSWindows users, DesertSci also provides tailored client tools enabling server-side resources such as ViewContacts and Scorpion to be called for any protein structure file with which you are working.