Sigmira is a Software Defined Radio (SDR) application program that runs on Windows and Linux. It operates with with an external conventional receiver, RFSpace SDR-IQ, RPSpace SDR-14, or SDR-RADIO.com networked receiver. Sigmira offers wideband spectrographic, waterfall, and phase plane displays. It also demodulates various military, utility, and "ham" radio signals.

Sigmira's features include:

"Waterfall" and spectrograph displays of up to 200 kHz width with the SDR-IQ/SDR-14.
Demodulation of HFDL, PSK31, FSK, SITOR-B, CW, and NFM modes.
Demodulation of NATO STANAG 4285.
Demodulation of the "Japanese Navy Slot Machine"
Point and click signal selection/tuning.
Signal Database with automated tuning and logging.
Phase plane display.
Playback of saved .wav files.
16 bit sampling. Typical sampling rate: 48 ksps.
Signal strength meter.
Adjustable squelch.
Clock display with UTC and local time.