Here is my small list of not too expensive FPGA evaluation and other types of boards that can be used for SDR projects. I am mostly familiar with Xilinx products therefore the list consist mainly of boards based on Xilinx chips.
This list will be updated from time to time.
Zynq FPGA based boards
- Zedboard (about 400$)
- Microzed (about 200-300$)
- Xilinx ZC702 (about 900$, including device locked Xilinx software)
- Red Pitaya, Open instruments for everyone (shown at the top of the page, about 450$, includes onboard 2 ADC-s and 2 DAC-s)
Spartan FPGA based
Well known USRP series from Nettus Research- Avnet boards
- Xilinx boards
- Digilent Inc. boards
- Opal Kelly boards
Altera FPGA chips