FLDigi is widely considered the best free alternative to HRD. It is both free and open source, runs on Windows, Linux, and Mac, and offers extensive support for digital modes. FLDigi includes logging capabilities, rig control, and a wide range of digital mode decoders.
: Following a massive backlash, the co-founder involved stepped down, and the company issued a public apology, vowing never to retaliate against negative reviews again.