- czmq - high-level C binding for ØMQ
- zclock - millisecond clocks and delays
- zctx - working with 0MQ contexts
- zfile - helper functions for working with files.
- zframe - working with single message frames
- zhash - generic type-free hash container
- zlist - generic type-free list container
- zloop - event-driven reactor
- zmsg - working with multipart messages
- zsocket - working with 0MQ sockets
- zsockopt - get/set 0MQ socket options
- zstr - sending and receiving strings
- zthread - working with system threads