RedHat is certainly the leader in terms of installed base. Many packages come out in RedHat format (with the .rpm extension). These can usually be installed in Debian with little effort. Use the alien package to convert from the .rpm to the .deb format then install that package:
$ fakeroot alien -d gmyclient-0.0.91b-1.i386.rpm $ wajig install gmyclient_0.0.91b-2_i386.deb