cbase is a C library that simplifies systems software development on UNIX. The library includes functions for memory management, string parsing, sub-process execution, filesystem traversal, I/O, interfaces to IPC mechanisms including pseudo-terminals, shared memory, semaphores, and other facilities. It also has implementations of common dynamic data structures like linked lists, queues, stacks, and hash tables, a real-time scheduler similar in functionality to the cron daemon, and high-level APIs to Berkeley sockets and other networking functions. Full API documentation is included.