  Non-local thermodynamic equilibrium (non-LTE) line formation for Ca I-Ca II,
Ti I-Ti II, and Fe I-Fe II is considered in model atmospheres of giant stars
with an effective temperature of 4000 K $\le$ Teff $\le$ 5000 K and a metal
abundance of -4 $\le$ [Fe/H] $\le$ 0. The departures from LTE are analyzed
depending on atmospheric parameters. We present the non-LTE abundance
corrections for 28 lines of Ca I, 42 lines of Ti I, 54 lines of Ti II, and 262
lines of Fe I and a three-dimensional interpolation code to obtain the non-LTE
correction online (http://spectrum.inasan.ru/nLTE/) for an individual spectral
line and given atmospheric parameters.
