toms707, a Fortran77 code which evaluates the confluent hypergeometric function for complex arguments of large magnitude, by Warren Perger, Atul Bhalla, and Mark Nardin.
toms707 is a version of ACM toms Algorithm 707.
The text of many ACM toms algorithms is available online through ACM: https://www.acm.org/pubs/calgo or NETLIB: https://www.netlib.org/toms/index.html.
The information on this web page is distributed under the MIT license.
toms707 is available in a Fortran77 version.