I know LAMMPSfe, but it is a little expensive for a student. MedeA and MAPS are more expensive.
I don't recommend any such tools. LAMMPS provides an opportunity for you to do simulations without knowing the solver. At least you need to know procedures and your physical models. Never expect to meet you here, good luck over there, boy.
I suggest you look for examples in directory "examples" in lammps package available to download from official lammps website, or look at tutorials here: https://icme.hpc.msstate.edu/mediawiki/index.php/LAMMPS_tutorials
I personally did not find any free softwares
I don't recommend any such tools. LAMMPS provides an opportunity for you to do simulations without knowing the solver. At least you need to know procedures and your physical models. Never expect to meet you here, good luck over there, boy.
I know one software named topoTools which can create LAMMPS input file by using commands like 'topo writelammpsdata'.
check this link: https://sites.google.com/site/akohlmey/software/topotools
cif2cell, if you have a cif file. https://sourceforge.net/projects/cif2cell/ "CIF2Cell is a tool to generate the geometrical setup for various electronic structure codes from a CIF (Crystallographic Information Framework) file. The program currently supports output for a number of popular electronic structure programs, including ABINIT, ASE, CASTEP, CP2K, CPMD, CRYSTAL09, Elk, EMTO, Exciting, Fleur, FHI-aims, Hutsepot, MOPAC, Quantum Espresso, RSPt, Siesta, SPR-KKR, VASP. " Since, LAMMPS can take many different formats of input, cif2cell cannot obviously generate all of them, however, you can get a basic input file, and modify it with simple script (python, C, etc., I used awk most of the times).
One can create a template input file for LAMMPS using Avogadro.
Winmostar is another software which could be linked with LAMMPS .
Ovito reads structures in many formats and writes data and dump files for LAMMPS.
You can follow
https://sites.google.com/site/akohlmey/software/topotools
1. MedeA (from Materials Design) can prepare structures and submit LAMMPS to run on them.
2. The structure can be build by Materials Studio interface (from Biovia) and saved as *.car file. Then use msi2lmp to generate the .data file (see https://www.researchgate.net/post/How_could_LAMMPS_input_geometry_file_be_generated_in_Materials_Studio).
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