Caveat: pycalphad requires programming knowledge (Python). But for a researcher or student, that is a valuable skill anyway.
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For those who absolutely cannot afford any license, there is (or the pycalphad Python library). These are open-source tools that implement CALPHAD-style calculations. They are not as polished or fast as Thermo-Calc, but they are free, transparent, and reproducible. With pycalphad, you can read open thermodynamic databases (e.g., from the NIST CALPHAD database) and perform equilibrium calculations. Caveat: pycalphad requires programming knowledge (Python)