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| Feature | QuantumATK | Free Alternative | Notes | |---------|------------|------------------|-------| | DFT with plane-waves | Yes | | Industry standard for periodic DFT. Huge community. | | DFT with atomic orbitals (NAO) | Yes (basis sets) | Siesta , FHI-aims (latter is free for academic use) | Siesta is excellent for large systems. | | NEGF for quantum transport | Core strength | TranSIESTA (part of Siesta), TBTK (C++ library) | TranSIESTA is the direct predecessor of QuantumATK's NEGF engine. | | Molecular dynamics | Yes | LAMMPS (classical), CP2K (DFT-MD) | LAMMPS is faster, CP2K is more flexible. | | GUI & visualization | Excellent (VNL) | ASE (Python library), XCrySDen , VESTA | ASE + Python gives you a scripting interface more powerful than most GUIs. | Quantumatk Crack
