Standards, Docs, etc.

This is a fine collection of references to documentations about programming and API standards. Especially public available resources, since unfortunately most offical standard documents are not distributed for free :-(

Official Standard documents

Well, often the "real official" standard documents are rather expensive. So the "clever" people know where the final drafts can be found ...

Definitions

The following list is taken from the linux man pages (INTRO(2) linux Programmer's Manual), which may not be really up-to-date. So I may decide to correct/update it from time to time.
SVr4
System V Release 4 Unix, as described in the "Programmer's Reference Manual: Operating System API (Intel processors)" (Prentice-Hall 1992, ISBN 0-13-951294-2)
SVID
System V Interface Definition, as described in "The System V Interface Definition, Fourth Edition", available in Postscript format at ftp.fpk.novell.com
[broken link! Better try at ftp.inf.tu-dresden.de ]
POSIX.1
IEEE 1003.1-1990 part 1, aka ISO/IEC 9945-1:1990s, aka "IEEE Portable Operating System Interface for Computing Environments", as elucidated in Donald Lewine's "POSIX Programmer's Guide" (O'Reilly & Associates, Inc., 1991, ISBN 0-937175-73-0.)
POSIX.1b
IEEE Std 1003.1b-1993 (POSIX.1b standard) describing real-time facilities for portable operating systems, aka ISO/IEC 9945-1:1996, as elucidated in "Programming for the real world - POSIX.4" by Bill O. Gallmeister (O'Reilly & Associates, Inc. ISBN 1-56592-074-0).
4.3BSD/4.4BSD
The 4.3 and 4.4 distributions of Berkeley Unix. 4.4BSD was upward-compatible from 4.3.
V7
Version 7, the ancestral Unix from Bell Labs.