RMcalc is the code which calculates RM of pulsar/FRB signals. 
Bayesian Lomb-Scargle periodogram is at the heart of the method.

The main script is RMcalc.py. Add alias RMcalc=/path/to/RMcalc.py and start calculate RMs of pulsar archives.
For help menu: RMcalc -h
For basic usage: RMcalc --RMlow -100 --RMhigh 100 --RMstep 0.01 -d .ar -s 0 --plot True