libsigrok is a shared C library which provides basic hardware access drivers for logic analyzers, oscilloscopes, MSOs, multimeters, dataloggers, and more. It also provides input/output file format support.
libmodbus is a software library for sending/receiving data according to the Modbus protocol. It is written in C and supports RTU (serial) and TCP (Ethernet) communications.
A network IDS and IPS engine.
A Web-based hotel and rental property management system.