SDR++ is a cross-platform and open source SDR software with the aim of
being bloat free and simple to use.

Features:
- Multi VFO
- Wide hardware support (both through SoapySDR and dedicated modules)
- SIMD accelerated DSP
- Cross-platform (Windows, Linux, OSX and BSD)
- Full waterfall update when possible. Makes browsing signals easier
  and more pleasant
- Modular design (easily write your own plugins)

Optional: bladeRF, Airspy, LimeSDR and PlutoSDR.
(not available at slackbuilds.org)