C++

• www.fredosaurus.com
• www.dreamincode.com
• Bjarne Stroustrup
• www.cplusplus.com
• tutorial from IBM
• www.parashift.com
• www.java2s.com
• www.learncpp.com
• FAQ, tips, tricks, including tons of interview questions
• www.mochima.com tutorials
• tips on managing C++ objects
• UWashington intro courses

C++ with a Finance twist

• Quantlib
• Stuff by Bernt Odegaard

R

• R project
• Sciviews, R GUI
• CRAN (CMU)
• R code and examples (D. Ruppert book)
• More R examples

General Knowledge

• freetechbooks
• codeproject
• geekinterview
• MIT OpenCourseWare