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OSSIE is an open source SDR development effort based at Wireless@Virginia Tech. The project's primary goals are to enable research and education in SDR and wireless communications. The software package includes: an SDR core framework based on the JTRS Software Communications Architecture (SCA); the Waveform Workshop, a set of tools for rapid development of SDR components and waveforms applications; and an evolving library of pre-built components and waveform applications. 
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Ettus Research LLC is a California based company now part of Analog Device, designing, manufacturing and selling USRP SDR radios. Those radios are architectured around FPGA based "motherboard chassis" ensuring A2D/D2A as well as connectivity functions, on which different "RF daughterboards" can be plugged in. The various daughterboards allow to cover from 0 to 2.5 GHz or more. They use from simple wide band differencial amplifiers for short-waves to "on-the-shelf silicon tuners" (like NXP TDA18272) for V-UHF. Typical RX A2D of the chassis are 14 bits 100 MS/s devices allowing 10 to 16 MHz digital aquisition. You can't expect top level dynamics with such architectures, nor ultra high resistance to "unwanted" jammers, but they fit to most of the classical SDR missions, and more important, exhibit a high "versatility/cost" ratio !
All schematics can be found at this address : http://code.ettus.com/redmine/ettus/projects/public/documents
USRP are supported by Mathlab, Labview, GNU-Radio, OpenBTS or OSSIE.
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Genesis Radio is producing and selling a series of HF SDR transceiver kits, roughly ranging from 150 to 350 $. They are using a very classical QSD/QSE architecture and potentially the well-known Si570 FracN synthesizer, but all the "commodities" are integrated (like TX/RX switching commodities) up to a realy well integrated SDR software "GSDR1.1" offering RX and TX image rejection and calibration, or 99 store/recall memories, for instance. They are also selling usefull accessories, like a 10 Watts PA.
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Here is an other GUI to control DttSP (Software DSP core), and thus implement SDR on multiple platforms... New blog here : http://g0orx.blogspot.com/
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An open software DSP core for SDR use, from Frank Brickle and Bob McGwier. Coded for LINUX or Windows, it is a good way to implement SDR systems on many platforms like LINUX (SDR-Shell or Java GUI and GTK+ GUI for instance) or Windows (Flexradio for instance), or even MAC or your i-Phone ! The SourceForge page for DttSP is here : http://sourceforge.net/projects/dttsp/
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SDR-Shell is a simple Software Defined Radio Graphical User Interface for controlling the DttSP sdr-core. It was implemented to be used with simple SDR receivers like the SoftRock and SDRZero. SDR-Shell was developed using the Qt Toolkit under Ubuntu (Debian) Linux. The transmit functions are currently being implemented to enable TX on simple SDR transceivers like the SoftRock RXTX 6.2.
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WiNRADiO Communications is a company commercializing professional SDR systems. Most of their products can't really be considered as low lost, but their WR-G31DDC (9KHz to 50 MHz) and WR-G305x serie (9KHz to 1.8GHz) are (relatively) low cost... Interfaces are USB or PCI.
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SDR Radio Console, is one of the best SDR software supporting a large variety of hardware. It is particularly supporting the radios from RF-Space. This software can thus be considered as a mix between amateur and professional applications. It is supporting IP remote control, among various interesting features...
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Based on Winrad at the origin, HDSDR is now one of the best SDR software you can freely find on the web. It provides reception, indeed, but also transmission with excellent performances in all modes (including FM). HDSDR is compatible with pure analog I/Q harware, but also with a large variety of commercial hardware using various interfaces. Supported hardware are presented here : http://www.hdsdr.de/hardware.html HDSDR : A must...
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A simple and terribly efficient SDR receiver from I2PHD. Works on relatively small machines. SDRadio is derived from Winrad. And thus suffers from a poor FM performance.
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SD (software-defined) radio receivers use a bare minimum of hardware, relying instead on their software capabilities. This SDR project demonstrates what’s achievable, in this case a multi-purpose receiver covering all bands from 150 kHz to 30 MHz. It’s been optimised for receiving DRM and AM broadcasts but is also suitable for listening in to the world of amateur transmissions.
A video of the author presenting his receiver can be found here : http://www.elektor.com/products/kits-modules/modules/070039-91-software-defined-radio.91475.lynkx
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M0KGK is an I/Q SDR transceiver. This software has not been updated for a long time, and might thus be unstable on some platforms, but it exhibits a very interesting performance, and most important, provides excellent modulation performances in transmission.
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Not really low cost as well, but an interesting receiver from the well-known AOR company. This really demonstrates the general trend towards SDR processing in radiocommunication systems On this "AOR Alpha", covering 10 KHz to 3.3 GHz, fast frequency processing is achieved by means of FFT and signals are visually displayed on the 6.4″ TFT LED display both spectrally or as a waterfall function. TV signals can also be displayed (NTSC, PAL).
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If you want to make your own GSM station, with an SDR hardware and an open software ... Here is a page for you !
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If your ambition is to develop your own SDR software or application, whatever your expertise level, from newbee to old fox, you'd better visit "GNU Radio" !
GNU Radio is a free software development toolkit that provides the signal processing runtime and processing blocks to implement software radios using readily-available, low-cost external RF hardware and commodity processors. It is widely used in hobbyist, academic and commercial environments to support wireless communications research as well as to implement real-world radio systems. GNU Radio applications are primarily written using the Python programming language, while the supplied, performance-critical signal processing path is implemented in C++ using processor floating point extensions where available. Thus, the developer is able to implement real-time, high-throughput radio systems in a simple-to-use, rapid-application-development environment.
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Pieter-Tjerk is a PhD, now assistant professor in the Design and Analysis of Communication Systems (DACS) group at the Electrical Engineering, Mathematics and Computer Science department of the University of Twente. Here is his (very informational) page on his SDR developments. You can also see his main personal page here : http://wwwhome.ewi.utwente.nl/~ptdeboer/
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Matchstiq SDR combines a broadband RF transceiver with CPU/FPGA processing to provide a complete stand-alone software-defined radio. Covers 300 to 3800 MHz. Not really low cost (around 4500 US$), no outstanding performances (though largely sufficient for a wide variety of portable applications), but well integrated, wide band, and realy suitable for mobile spectrum RF measurements and control. Visit Epiq Solutions web pages. They have realy interesting SDR products !
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From Edson Pereira, the author of SDR-Shell, and João K. de Marco. A classical but realy well-designed QSD I/Q type receiver for low bands. Take a look at the schematics...
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Many enthusiasts or even company's fellows are contributing to the "more or less free" SDR "GNU Radio"...Here is a site presenting an effort to port some GNU radio work to the famous OMAP3 BeagleBoard. "Build your radio on a BeagleBoard" is however not totally correct...You still need some (critical) RF...As ever... ;o)
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Here is a series of SDR receivers covering 10KHz to around 32 MHz. They exhibit outstanding performances with basebands from 196 KHz up to 2 MHz depending on models. Some models are with embedded Ethernet 100 base-T (UDP/TCP/IP) for remote web control.
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An I/Q SDR receiver for those who love MAC ! Compatible with some well-known Hardware for additional controls.
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After Alberto stopped his effort on Winrad, Jeffrey Pawlan (WA6KBL), became the new "animator". Last versions of Winrad are thus available here.
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Winrad has been one of the first software for low cost SDR. Probably one of the most popular ! Receiver only. It is stable and exhibits excellent performance in general, except for the FM demodulator, which is not state of the art. Winrad freely provided by its author, became the base of many SDR software like Winrad-F or HDSDR.
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Here is a quite complete SDR receiving software, initially designed for the ELEKTOR SDR I/Q shortwave receiver.
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This time...Yep...This is low cost. Won't tell you the price here ;o) You will not replace a general coverage receiver, or a measuring equipment. You will not operate under strong signal neither, but you will make interesting experiments. The idea of the designers was to base the device around a low cost chipset : -E4000 TV tuner IC from Elonics as RF front end -TLV320AIC3104 audio codec from TI as baseband A2D -PIC24FJ32GB002 µC from Microchip
And that's it, we have FUNcube Dongle !
Go to Download page here : http://www.funcubedongle.com/?page_id=313
And to introduction and architecture document here : http://www.funcubedongle.com/MyImages/FCDAnIntroduction.pdf
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