Finance

Investopedia - Educating the world about finance

The Treasurer's wiki - leading treasury professionals

Wilmott - serving the quantitative finance community (forums page)

QuantLib - A free/open-source library for quantitative finance

QUARC - Quantitative Research Centre

OpenGamma's Quantitative Research

Default Risk - the web's biggest credit risk modelling resource

Elite Trader - group of financial traders that help each other work

Market Data

FED Reaserch Economic Data - IRs

FED Reaserch Economic Data - FX

FED Reaserch Economic Data - Stocks and Bonds

FED Reaserch Economic Data - Commodities

SEB Live swap rates

Sentry Derivatives - Fx Options Live

Bossa

Stooq

C++, programming and more

Standard C++ Foundation

Cygwin project homepage

OOQP - Object-Oriented software for Quadratic Programming

GNU Scientific Library - a collection of numerical routines for scientific computing

Boost - free peer-reviewed portable C++ source libraries

Doxygen - Generate documentation from source code

StackOverflow - C++ questions

Source Making

Kompilacja w GCC krok po kroku

GCC and Make Compiling, Linking and Building C/C++ Applications

Mathematics

Wolfram MathWorld - the web's most extensive mathematics resource

Cross Validation - Q&A site: statistics, machine learning, data analysis

People

Emanuel Derman's blog

John C. Hull's homepage

Mark Joshi's homepage (RIP [*])

Bjarne Stroustrup's homepage

Scott Meyers Website

Misc

Bjarne Stroustrup - The Essence of C++

Bjarne Stroustrup - C++ Today

Scott Meyers - Why C++ Sails When the Vasa Sank

Scott Meyers - An Effective C++11/14 Sampler

Emacs as a C/C++ Editor/IDE (Part I)

Emacs as a C/C++ Editor/IDE (Part II)

Emacs as a C/C++ Editor/IDE (Part III)

Emacs as a C/C++ Editor/IDE (Part IV)