GitHub user unixpunk has been working on a custom firmware image for the PlutoSDR called 'PlutoWeb' (more info available on their website as well). The firmware allows you to run a web interface on the PlutoSDR and this allows you to run server programs such as OpenWebRX, Dump1090 and streaming servers like SoapyRemote. Because the PlutoSDR has a built in processor, this firmware can turn the SDR into a fully standalone device.
The PlutoSDR is an Analog Devices $99 RX/TX capable SDR with 20 MHz of bandwidth and a 325 MHz to 3.8 GHz frequency range that is software hackable to 56 Mhz of bandwidth and a 70 MHz to 6000 MHz frequency. It has an on board Xilinx Zynq Z-7010 FPGA, which has a built in dual core ARM Cortex-A9 processor as well. It has been out of stock for a while, but was recently restocked and can be purchased directly from Analog Devices, or via Arrow, DigiKey or Mouser.