open-source IEEE 802.11 WiFi baseband FPGA (chip) design
Linrad (together with an A/D converter hardware) forms an SDR receiver
morse daemon for the serial or parallel port
KB1OIQ Ham Radio Projects
Audio (dynamic) compression utility
Futaba, Art-Tech, Transmitter PPM Channel Expander with Arduino
Data transmission through low-tech communication media
Bluetooth Low Energy (BLE) packet sniffer and transmitter
#2 - Red Pitaya Ecosystem and Applications
UART Data Communication Over a Fiber Network
The Android-smartphone universal television remote