Plan 9 from Bell Labs
History of the Plan 9 kernel (1990 - 2003)
Connect to Plan 9 CPU servers from other operating systems.
Libtask is a simple coroutine library
Plan 9 from Bell Labs, with contributions.
A native pcap library written in Go.
Libelf is a simple library to read ELF files
Portable, simple C-language 9P client and server libary.
Plan 9 from Bell Labs, under GPL
Unix port of the Plan 9 regular expression library
started time in 18 days