The nosh source package is a compressed tar archive:
This is a self-contained slashpackage-style package. That's a whole subject in itself. The nosh Guide has a chapter on building from source that has the details.
It is known to build, run, and work on PC-BSD/TrueOS 10, FreeBSD 10, and Debian Linux version 7 and later. It should similarly build, run, and work on any modern BSD and on any modern Linux flavour.
It builds and runs on OpenBSD 5.9, and works subject to OpenBSD's several limitations.
(One mirror of my WWW site is served by Bernstein publicfile running from the nosh UCSPI-TCP tools under nosh service management, via OpenBSD 5.9 rc.)
It might similarly build, run, and work on Hurd (although Debian Hurd has proven to be so broken in even basic things like the Debian installer that it has as yet not been possible to upload it to and compile it on a Hurd system).