The best replacement for hdsdr is sdr#.

The best alternatives to hdsdr are rated as following:
★★★★★  sdr#
★  sdrsharp

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Speaking about hdsdr, one probably shouldn't forget about rtl.

Other search terms related to hdsdr and their ratings are:
★★★★★ rtl
★★★★ r820t
★★★★ elecraft kx3
★★★ funcube
★★ funcube dongle
kx3
You have in mind a companion for hdsdr and it is not yet here? Propose!



Google Trends

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hdsdr
sdr#
sdrsharp