This page has a C/C++ bias!
See elsewhere for general software links and recommendations, source code and programs of mine and for Whisker and related programs.

C++ language

C++ Language Tutorial
C++ FAQ Lite (UK mirror)
The Unofficial C for Dummies page
Reference. When nothing else will do: the ANSI C++ draft standard (PDF), DJGPP's standard C library reference.
Old links: Shareware C++ language tutorial from Coronado Enterprises. Also JDM's directory. Documentation links from Southampton. The C/C++ Users Group. Ask the C++ Pro. TPH coding standard.

Compilers

Boost libraries.These are a set of source code libraries of high standards, including libraries for pointer handling, string manipulation, serialization, and lots more.
Available C++ Libraries FAQ
Imatix Standard Function Library.
Dinkum C++ Library Reference.
Standard Template Library. Source code for examples from STL Tutorial and Reference Guide (Musser & Saini, 1996). The STL Resource List. Silicon Graphics' STL Programmers' Guide. The SGI site also provides implementations of ropes. The Dinkumware STL reference; the RPI online reference.