I was reading misc. programming related articles and came across this:
Google Chrome browser shows excellent example of code reuse. I found that they use at least 25 different software libraries!
Here is the full list of libraries, along with relative paths to source code and short library descriptions. Many of the libraries have been patched by googlers; look for README.google files in each library directory for information about changes.
It's pretty interesting if you're interested in programming / OOP..
Link