Since this thread has become very long, and many links are broken, and some that work have no information, I decided to make a list of all the links that are currently working and what they contain. This is good as of June 13 2005 9:00 -5 GMT
Please don't post/PM "Thislink" is/isn't working. Its annoying and it just makes the thread longer, you want to tell people what is/isn't working; you make the list.
So hopefully this makes someones life easier.
*I attached the nonworking links if anyone cares, also a few untested because they were all in one post and I was lazy
Working::
hxxp://www.hackersplayground.org/books.html :: Coding/Database, Linux/Unix, Windows, networking, Misc
hxxp://www.kickme.to/zap :: Frontend for Googling pdf files
hxxp://valle.fciencias.unam.mx/libros.htm :: Algebra Texts in In Spanish
hxxp://www.comms.scitech.susx.ac.uk/fft/ :: Computer Programming, VHDL, Operating systems, Cryptography, Security, networking, Computer Clusters, Bluetooth, Mathematics, Engineering, UNIX, USENIX, Miscelaneous
hxxp://www.eastasp.com/zh-cn/ebooks/index.aspx# :: Many Programming books
hxxp://onlinebooks.library.upenn.edu/webbin/book/subjectstart?QA :: Online Mathematics Books
hxxp://www.intelinfo.com/free_it_training_materials_and_books.html :: Free IT Training Materials and Books
hxxp://www.yatyat.dns2go.com:3993/pub/reference_docs :: Program Manuals/Guides
hxxp://www.emperorsrage.com/RTFM :: Free BSD, Security, Administration, DNS and BIND, Apache
hxxp://safariexamples.informit.com/ :: Companion Programs to Books, Organized by ISBN #
hxxp://mirrors.usaaa.ru:8001/ :: Oreilly Ebooks
hxxp://www.et.utt.ro/public/Docs/ :: Programming
hxxp://stommel.tamu.edu/~baum/programming.html :: A list of freely available documents (i.e. tutorials, books, guides, reference manuals, etc.) for learning how to program in various languages
f*p://217.11.138.10/books/ :: Programming Books
f*p://202.118.66.15/pub/books/ :: Programming, Linux
hxxp://maththinking.com/boat/computerbooks.html :: Free Computer Books, Tutorials, Lecture Notes
f*p://194.105.193.56/pub/warez/books/ :: Programming, OS, Web
hxxp://docs.msfree.ca/ebooks/ :: Linux, Solaris
hxxp://www.fixdown.com/new/new04_1.htm :: Misc Tech Ebooks
hxxp://www.click-now.net/ebooks.htm :: Misc Ebooks (who knew you could trust a site called "click-now")
hxxp://www.turboreactor.com/TRSEbooks.htm :: Misc Books, A Few Tech Book
hxxp://www.windowsitlibrary.com/ebooks/administeringad/Index.cfm :: Windows 2003: Active Directory Administration Essentials
hxxp://coweb.cc.gatech.edu:8888/uploads/cs1315/807/ :: Draft of Introduction to Media Computation: A Multimedia Cookbook in Python
hxxp://coweb.cc.gatech.edu/mediaComp-plan/uploads/101/mediacompBook.pdf :: Introduction to Computing and Programming in Java:a Multimedia Approach
hxxp://www.lisa.org/interact/2003/SoftwareTesting.zip :: Free Book on Software Testing and Internationalization
hxxp://abel.sk.tsukuba.ac.jp/~janos/bookshelf/ :: Free Linux, Programming, Misc books
hxxp://www.flashdance.cx/books/ :: O'reilly Books, Few others
hxxp://www.cacr.math.uwaterloo.ca/hac/ :: The Handbook of Applied Cryptography
hxxp://citrin.pp.ru/docs/ :: OS, Programming, Misc Tech
hxxp://docs.rinet.ru/ :: Free Books on Internet, Web Design, Perl, Java, Database, Unix, Networks, Netware, Microsoft
f*p://131.204.110.10/pub/dalvish/Documents/apps/learning-linux :: 12 Books on Learning Linux
hxxp://avaxhome.ru/ebooks/ :: Random Ebooks
hxxp://www.acm.uiuc.edu/sigmil/RevEng/index.html :: Online book about reverse engineering software under both Linux and Microsoft Windows
hxxp://giuciao.altervista.org/free_books.html :: OS, Internet, networking, Programming, Design and CAD. All books are offsite links so some may be broken
hxxp://www.geocities.com/nothing_tk/Programming_Windows_Fifth_Edition.zip :: Programming Window Fifth Edition by Charles Petzold
hxxp://www.geocities.com/nothing_tk/The_Art_of_Assembly_Language.zip :: The Art of Assembly Language
hxxp://212.14.233.133/portal_resources/downloads.jsp :: Programming, Database, Web, networking, Multimedia, OS, XML
hxxp://www.intelinfo.com/newly_researched_free_training/Oracle.html :: Oracle Training and Tutorials
hxxp://utopia.duth.gr/~sn7895/ :: Misc Programming Texts
hxxp://www.delmar.edu/Courses/ITSY1300/eBooks/ :: Security Books
hxxp://hinst.net/~ragtucaj/utilities/ :Working: Programming, Linux
hxxp://autonomous.tv/~spencer/books/pdf/ :: O'reilly
hxxp://wxw.paulpbaker.com/ebooks.htm :: Misc Ebooks, Some windows XP Books, Some Broken Links
hxxp://www.drpaulcarter.com/pcasm/ :: PC Assembly Language
f*p://193.231.20.1/ :: Programming, OS, Window, Web
hxxp://xammep.nm.ru/doc/ :: Offsite Links so Some Broken Links, Programming, Web, Security
hxxp://files.nixp.ru/books/ :: Programming, Software, Security, SQL, Unix
hxxp://www.best.tuke.sk/~ejo/books/ :: Math, Science, Algorithms
hxxp://madchat.org/crypto/ :: Cryptography
hxxp://www.msfirewall.org/isa2004kits.htm :: ISA Server 2004 Kits and Guides
hxxp://a1book.tripod.com/ :: Certification
hxxp://dragon.rulez.cz/e-buk/ :: Popular Novels
hxxp://babybluevn.co.nr/modules.php?name=News&new_topic=8 :: Misc IT books, files hosted on Megaupload
hxxp://physics.dit.ie/resources/physicstech4/comp/ :: Computational Physics
hxxp://www.phptr.com/promotions/promotion.asp?promo=1484&redir=1&rl=1 :: Bruce Perens' Open Source Series, you can purchase hardcover but PDF is free
hxxp://www.itlibitum.ru/library/BOOK/ENGLISH/THEMES/CPP/ :: C++ Books
hxxp://plg.lrn.ru/doc/ :: A few Programming Books
hxxp://ilib.mirror0.mccme.ru/index.htm :: Mathematics Ebooks in Russian
http://www.maugmasti.com/ebook/Addison%20Wesley%20-%20Find%20the%20Bug%20A%20Book%20of%20Incorrect%20Programs.chm :: Find the Bug A Book of Incorrect Programs
RapidShare::
hxxp://www.apress.com/free/index.html :: A few Programming Books
hxxp://rapidshare.de/files/1719643/Wiley.Reversing.Secrets.of.Reverse.Engineering.Apr.2005.eBook-DDU.rar.html :: Reversing Secrets of Reverse Engineering
hxxp://rapidshare.de/files/1700034/sore.rar.html :: Reversing Secrets of Reverse Engineering, Another Link, may be password protected
hxxp://rapidshare.de/files/1083824/Addison.Wesley.Windows.System.Programming.3rd.Edition.Oct.2004.eBook-LiB.zip.html :: Windows System Programming
hxxp://rapidshare.de/files/1797284/OReilly.Visual.Studio.Hacks.Mar.2005.eBook-DDU.rar.html :: Visual Studio Hacks, Password: ebooksclub
hxxp://rapidshare.de/files/1057846/Software_Exorcism._A_Handbook_for_Debugging_and_Optimizing_Legacy_Code_-_APress_.rar.html :: Software Exorcism, Password: http://babybluevn.co.nr
hxxp://rapidshare.de/files/1244541/Addison.Wesley.The.Art.of.Computer.Virus.Research.and.Defense.Feb.2005.eBook-LiB.zip.htm :: The Art of Computer Virus Research and Defense
Partially Working::
hxxp://orforum.cjb.net :: You Must Register and Contribute Before Downloading
hxxp://aleria.net/0/0 :: In Russian, Many Book Links are Edonkey Links
hxxp://kazus.ru/modules.php?name=EBooks :: Access to EBooks is only Availabe to Registered Users
hxxp://ebuki.powernews.ru/ :: Only accessible to Russian IP Addresses
f*p://ftp1.cnfug.org/pub/Books/ :: Very Large collection of Books however I had trouble downloading
hxxp://www.smileybooks.net/ :: Access to EBooks is only Availabe to Registered Forum Users, Books are hosted on Rapidshare
Exetools Attachments::
http://www.exetools.com/forum/showpost.php?p=29489&postcount=110
http://www.exetools.com/forum/showpost.php?p=30744&postcount=118
http://www.exetools.com/forum/showpost.php?p=34644&postcount=160