IP Filter  
   TCP/IP Packet Filtering package
   http://coombs.anu.edu.au/~avalon/

Autoconf Tutorial  
   Introduction to programming using GNU's autoconf system. Autoconf simplifies the porting process and provides a consistent build interface for system administrators.
   http://nis-www.lanl.gov/~rosalia/mydocs/autoconf_tutorial_toc.html

Unix programming resources and examples  
   Annotated source code examples for most Unix system and library calls. Plus working source code examples of some classic algorithms.
   http://www.yendor.com/programming/

Wildcard Pattern Matching  
   C routine to check whether a string matches a unix wildcard. '*', '?', sets of characters, and negated sets of characters are supported.
   http://user.cs.tu-berlin.de/~schintke/references/wildcards/index.html

Serial Programming Guide for POSIX Operating Systems  
   Programming serial ports in Unix.
   http://www.easysw.com/~mike/serial/

UNIX Programming Tools, POSIX, LINUX, VMS  
   A C programming library for creating cross platform user interfaces across Unix, Linux, Posix, VMS, DOS and Windows. This User Interface Library provides over 500 functions for creating interfaces that..
   http://www.vtsoft.com/products/unixview.html

TotalView Multiprocess Debugger  
   TotalView is a source-level, graphical debugger for applications written in most popular languages, such as C, C++, and Fortran. It supports multiprocess, multithreaded, and parallel programs.
   http://www.etnus.com/products/totalview/index.html

Unix Testing Tools - Vermont Test/Terminal  
   Vermont Test/Terminal extends the functionality of Vermont Test for DOS with the ability to monitor serial communications for testing host-based applications. In association with a terminal emulator such as Procomm 2.43,
   http://www.vtsoft.com/products/testterminalv20.html

UNIX and Programming Section  
   Tutorials and manuals for Java and PHP.
   http://www.softlab.ece.ntua.gr/facilities/documentation/unix/

FAQ: Programming Unix Sockets in C  
   Almost everything you want to know about programming Unix sockets.
   http://www.manualy.sk/sock-faq/unix-socket-faq.html

Libsafe  
   Wrapper which prevents stack overflows at run time.
   http://www.research.avayalabs.com/project/libsafe/index.html

FAQ: comp.unix.programmer  
   FAQs in some different formats.
   http://www.whitefang.com/sup/

lex/yacc, 2nd Edition  
   lex yacc, 2nd Edition
   http://www.oreilly.com/catalog/lex/