The Modulopt collection is formed of problems with the following features:

• they have an optimization nature,
• they can be smooth or nonsmooth;
• they are written in Fortran 90/95/2003;
• they are issued from various application areas in scientific or industrial computing;
• they can be freely distributed.

It has two companion collections, made of problems with an academic nature:

• the Modulopttoys collection is writen in Fortran 90/95/2003,
• the Moduloptmatlab collection is written in Matlab.