Here is a list of all documented files with brief descriptions:

[detail level 123]

include
radcli
radcli.h	Public API of the radcli library
version.h
freeradius-client.h	Compatibility header for freeradius-client; includes radcli.h
radiusclient-ng.h	Compatibility header for radiusclient-ng; includes radcli.h
lib
aaa_ctx.c
avpair.c
buildreq.c
config.c
dict.c
hmac.c
ip_util.c
log.c
md5.c
nettle-hmac.c
rc-md5.c
sendserver.c
tls.c
util.c
src
radexample.c	Minimal example of using the radcli library for authentication