free freebsd book by greg 'grog' lehey.
"Ruby Grundlagen โ PDF zum Buch 'RapidWeb Development mit Ruby on Rails'"
open source as business strategy. ron goldman, richard p. gabriel.
"If you're even thinking of doing any security engineering, you need to read this book" โ bruce schneier
secure programming techniques. gene spafford, simson garfinkel, alan schwartz.
mark mitchell, jeffrey oldham, and alex samuel.