Tools
git
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http://help.github.com/git-cheat-sheets/ – Links to several different git cheat sheets
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http://git-scm.com/book/en – A very good (free) online book on git
valgrind
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http://www.cprogramming.com/debugging/valgrind.html – A short introduction to valgrind
Programming
C
C++
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http://www.parashift.com/c++-faq-lite/ – The C++ FAQ
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http://yosefk.com/c++fqa/ – The C++ FQA, an “answer” to the above FAQ, explaining the reasons behind some things in more detail (to be taken with a grain of salt)
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http://www.cplusplus.com/reference/ – A quick overview over the C++ standard library
POSIX
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http://pubs.opengroup.org/onlinepubs/9699919799/idx/index.html – IEEE Std 1003.1, 2008 Edition aka “POSIX Standard”
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http://www.faqs.org/faqs/unix-faq/faq/part3/section-13.html – How to get rid of zombie processes
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https://computing.llnl.gov/tutorials/pthreads/ – Good tutorial on pthreads