  The purpose of this paper is to introduce Condensed-Matter-Laboratory (CML)
application for simulating solids and nanostructures and calculating different
properties of them by density functional theory and using Green's function
theory in tight-binding approximation to calculate phononic and spin dependent
or independent electronic properties of different systems. Also, it can be used
for calculating thermodynamic properties of solids and nanostructures using
statistical mechanics. The CML is a cross-platform application with a graphical
user interface design that is user-friendly and easy to work with. This
application is written in c++ and fortran and has parallel processing ability.
To show flexibility of this application some reasons are presented.

Mesoscale and Nanoscale Physics;Statistical Mechanics;Quantum Physics