*[The Future of the Internet](http://futureoftheinternet.org/)
*[The Architecture of Open Source Applications: Vol. 1: Elegance, Evolution, and a Few Fearless Hacks; Vol. 2: Structure, Scale, and a Few More Feerless Hacks](http://www.aosabook.org/en/index.html)
*[The Performance of Open Source Applications](http://aosabook.org/en/)
*[The Future of Ideas](http://the-future-of-ideas.com/download/lessig_FOI.pdf)
####Information Retrieval
*[Introduction to Information Retrieval](http://nlp.stanford.edu/IR-book/information-retrieval-book.html)
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*[Confessions of an IT Manager](http://download.red-gate.com/ebooks/DotNet/Confessions_IT_Manager.zip)*(RedGate, By Phil Factor)*
####Cryptography
*[Handbook of Applied Cryptography](http://cacr.uwaterloo.ca/hac/index.html)
###Ada
*[Ada 95: The Craft of Object-Oriented Programming](http://faculty.cs.wwu.edu/reedyc/AdaResources/bookhtml/contents.htm)
*[Practical Regression and Anova using R](http://cran.r-project.org/doc/contrib/Faraway-PRA.pdf)(PDF)
*[Data Mining with R](http://www.dcc.fc.up.pt/~ltorgo/DataMiningWithR/book.html)
###Racket
*[Programming Languages: Application and Interpretation](http://cs.brown.edu/courses/cs173/2012/book/index.html)
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###Security
*[OWASP Top 10 for .NET Developers](http://www.troyhunt.com/2011/12/free-ebook-owasp-top-10-for-net.html)
*[Intrusion Detection Systems with Snort](http://ptgmedia.pearsoncmg.com/images/0131407333/downloads/0131407333.pdf)
###Sed
*[Sed - An Introduction and Tutorial](http://www.grymoire.com/Unix/Sed.html)
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*[Developing Time-Oriented Database Applications in SQL](http://www.cs.arizona.edu/people/rts/publications.html)
*[Use The Index, Luke!: A Guide To SQL Database Performance](http://use-the-index-luke.com/)
*[Learn SQL The Hard Way](http://sql.learncodethehardway.org/)
*[SQL For Web Nerds](http://philip.greenspun.com/sql/)
###SQL Server
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###TypeScript
*[TypeScript Succinctly, Syncfusion](http://www.syncfusion.com/resources/techportal/ebooks/typescript)(PDF, Kindle) *(Just fill the fields with any values)*
###Unix
*[A User's Guide for GNU AWK](http://www.math.utah.edu/docs/info/gawk_toc.html)
###Vim
*[A Byte of Vim](http://www.swaroopch.com/notes/Vim)