Estruturas de dados
libdb - Simple, memory-safe data-structures in C.foundation_lib - Cross-platform public domain foundation library in C providing basic support data types and functions to write applications and games in a platform-independent fashion.
Database
Sqlite - SQLite is a software library that implements a self-contained, serverless, zero-configuration, transactional SQL database engine. SQLite is the most widely deployed SQL database engine in the world.MongoDBClient - A high-performance MongoDB driver for C.
libcouchbase - The couchbase client for C.
Redes
libetpan - Mail Framework for C Languagelibmodbus - A Modbus library for Linux, Mac OS X, FreeBSD, QNX and Windows
WEB
libjson - a JSON parser and printer library in C. easy to integrate with any model.libebb - a lightweight high-performance HTTP server library for C
onion - HTTP server library in C designed to be lightweight and easy to use
mongoose - Embedded web server for C/C++
IO
liphenon - library of awesome for C appsUtils
libcli - Libcli provides a shared library for including a Cisco-like command-line interface into other software. It's a telnet interface which supports command-line editing, history, authentication and callbacks for a user-definable function tree.fossil - Simple, high-reliability, distributed software configuration management