Calib 7.0.4 is free to download from our software library. This free tool was originally designed by M Stuiver and PJ Reimer. Calib lies within Office Tools, more precisely General.
From the developer:
CALIB makes the conversion from radiocarbon age to calibrated calendar years by calculating the probability distribution of the sample's true age.
You may want to check out more software, such as Mulimedia Logic, Control 2008 or Theatre Of War, which might be similar to Calib.