SQL injection scanning
0x90.org: home of Absinthe, Mezcal, etc - http://0x90.org/releases.php
SQLiX - http://www.owasp.org/index.php/Category:OWASP_SQLiX_Project
sqlninja: a SQL Server injection and takover tool - http://sqlninja.sourceforge.net/
JustinClarke's SQL Brute - http://www.justinclarke.com/archives/2006/03/sqlbrute.html
BobCat - http://www.northern-monkee.co.uk/projects/bobcat/bobcat.html
sqlmap - http://sqlmap.sourceforge.net/
Scully: SQL Server DB Front-End and Brute-Forcer - http://www.sensepost.com/research/scully/
FG-Injector - http://www.flowgate.net/?lang=en&seccion=herramientas
PRIAMOS - http://www.priamos-project.com/
Web application security malware, backdoors, and evil code
W3AF: Web Application Attack and Audit Framework - http://w3af.sourceforge.net/
Jikto - http://busin3ss.name/jikto-in-the-wild/
XSS Shell - http://ferruh.mavituna.com/article/?1338
XSS-Proxy - http://xss-proxy.sourceforge.net
AttackAPI - http://www.gnucitizen.org/projects/attackapi/
FFsniFF - http://azurit.elbiahosting.sk/ffsniff/
HoneyBlog's web-based junkyard - http://honeyblog.org/junkyard/web-based/
BeEF - http://www.bindshell.net/tools/beef/
Firefox Extension Scanner (FEX) - http://www.gnucitizen.org/projects/fex/
What is my IP address? - http://reglos.de/myaddress/
xRumer: blogspam automation tool - http://www.botmaster.net/movies/XFull.htm
SpyJax - http://www.merchantos.com/makebeta/tools/spyjax/
Greasecarnaval - http://www.gnucitizen.org/projects/greasecarnaval
Technika - http://www.gnucitizen.org/projects/technika/
Load-AttackAPI bookmarklet - http://www.gnucitizen.org/projects/load-attackapi-bookmarklet
MD's Projects: JS port scanner, pinger, backdoors, etc - http://michaeldaw.org/my-projects/
Web application services that aid in web application security assessment
Netcraft - http://www.netcraft.net
AboutURL - http://www.abouturl.com/
The Scrutinizer - http://www.scrutinizethis.com/
net.toolkit - http://clez.net/
ServerSniff - http://www.serversniff.net/
Online Microsoft script decoder - http://www.greymagic.com/security/tools/decoder/
Webmaster-Toolkit - http://www.webmaster-toolkit.com/
myIPNeighbbors, et al - http://digg.com/security/MyIPNeighbors_Find_Out_Who_Else_is_Hosted_on_Your_Site_s_IP_Address
PHP charset encoding - http://h4k.in/encoding
data: URL testcases - http://h4k.in/dataurl
Browser-based security fuzzing / checking
Zalewski's MangleMe - http://lcamtuf.coredump.cx/mangleme/mangle.cgi
hdm's tools: Hamachi, CSSDIE, DOM-Hanoi, AxMan - http://metasploit.com/users/hdm/tools/
Peach Fuzzer Framework - http://peachfuzz.sourceforge.net/
TagBruteForcer - http://research.eeye.com/html/tools/RT20060801-3.html
PROTOS Test-Suite: c05-http-reply - http://www.ee.oulu.fi/research/ouspg/protos/testing/c05/http-reply/index.html
COMRaider - http://labs.idefense.com
bcheck - http://bcheck.scanit.be/bcheck/
Stop-Phishing: Projects page - http://www.indiana.edu/~phishing/?projects
LinkScanner - http://linkscanner.explabs.com/linkscanner/default.asp
BrowserCheck - http://www.heise-security.co.uk/services/browsercheck/
Cross-browser Exploit Tests - http://www.jungsonnstudios.com/cool.php
Stealing information using DNS pinning demo - http://www.jumperz.net/index.php?i=2&a=1&b=7
Javascript Website Login Checker - http://ha.ckers.org/weird/javascript-website-login-checker.html
Mozilla Activex - http://www.iol.ie/~locka/mozilla/mozilla.htm
Jungsonn's Black Dragon Project - http://blackdragon.jungsonnstudios.com/
Mr. T (Master Recon Tool, includes Read Firefox Settings PoC) - http://ha.ckers.org/mr-t/
Vulnerable Adobe Plugin Detection For UXSS PoC - http://www.0x000000.com/?i=324
About Flash: is your flash up-to-date? - http://www.macromedia.com/software/flash/about/
Test your installation of Java software - http://java.com/en/download/installed.jsp?detect=jre&try=1
WebPageFingerprint - Light-weight Greasemonkey Fuzzer - http://userscripts.org/scripts/show/30285
PHP static analysis and file inclusion scanning
PHP-SAT.org: Static analysis for PHP - http://www.program-transformation.org/PHP/
Unl0ck Research Team: tool for searching in google for include bugs - http://unl0ck.net/tools.php
FIS: File Inclusion Scanner - http://www.segfault.gr/index.php?cat_id=3&cont_id=25
PHPSecAudit - http://developer.spikesource.com/projects/phpsecaudit
A Greasemonkey Replacement can be found at http://yehg.net/lab/#tools.greasemonkey
Php-Brute-Force-Attack Detector - Detect your web servers being scanned by brute force tools such as WFuzz, OWASP DirBuster and vulnerability scanners such as Nessus, Nikto, Acunetix ..etc. http://yehg.net/lab/pr0js/files.php/php_brute_force_detect.zip
PHP-Login-Info-Checker - Strictly enforce admins/users to select stronger passwords. It tests cracking passwords against 4 rules. It has also built-in smoke test page via url loginfo_checker.php?testlic
Web application non-specific static source-code analysis
Pixy: a static analysis tool for detecting XSS vulnerabilities - http://www.seclab.tuwien.ac.at/projects/pixy/
Brixoft.Net: Source Edit - http://www.brixoft.net/prodinfo.asp?id=1
Security compass web application auditing tools (SWAAT) - http://www.owasp.org/index.php/Category:OWASP_SWAAT_Project
An even more complete list here - http://www.cs.cmu.edu/~aldrich/courses/654/tools/
A nice list that claims some demos available - http://www.cs.cmu.edu/~aldrich/courses/413/tools.html
A smaller, but also good list - http://spinroot.com/static/
Yasca: A highly extensible source code analysis framework; incorporates several analysis tools into one package. http://www.yasca.org/
Static analysis for C/C++ (CGI, ISAPI, etc) in web applications
RATS - http://www.securesoftware.com/resources/download_rats.html
ITS4 - http://www.cigital.com/its4/
FlawFinder - http://www.dwheeler.com/flawfinder/
Splint - http://www.splint.org/
Uno - http://spinroot.com/uno/
BOON (Buffer Overrun detectiON) - http://www.cs.berkeley.edu/~daw/boon/ http://boon.sourceforge.net
Valgrind - http://www.valgrind.org/
Java static analysis, security frameworks, and web application security tools
LAPSE - http://suif.stanford.edu/~livshits/work/lapse/
HDIV Struts - http://hdiv.org/
Orizon - http://sourceforge.net/projects/orizon/
FindBugs: Find bugs in Java programs - http://findbugs.sourceforge.net/
PMD - http://pmd.sourceforge.net/
CUTE: A Concolic Unit Testing Engine for C and Java - http://osl.cs.uiuc.edu/~ksen/cute/
EMMA - http://emma.sourceforge.net/
JLint - http://jlint.sourceforge.net/
Java PathFinder - http://javapathfinder.sourceforge.net/
Fujaba: Move between UML and Java source code - http://wwwcs.uni-paderborn.de/cs/fujaba/
Checkstyle - http://checkstyle.sourceforge.net/
Cookie Revolver Security Framework - http://sourceforge.net/projects/cookie-revolver
tinapoc - http://sourceforge.net/projects/tinapoc
jarsigner - http://java.sun.com/j2se/1.5.0/docs/tooldocs/solaris/jarsigner.html
Solex - http://solex.sourceforge.net/
Java Explorer - http://metal.hurlant.com/jexplore/
HTTPClient - http://www.innovation.ch/java/HTTPClient/
another HttpClient - http://jakarta.apache.org/commons/httpclient/
a list of code coverage and analysis tools for Java - http://mythinkpond.blogspot.com/2007/06/java-foss-freeopen-source-software.html
Microsoft .NET static analysis and security framework tools, mostly for ASP.NET and ASP.NET AJAX, but also C# and VB.NET
Visual Studio 2008 Code Analysis, available in:
VSTS 2008 Development Edition (http://msdn.microsoft.com/vsts2008/products/bb933752.aspx) and
VSTS 2008 Team Suite (http://msdn.microsoft.com/vsts2008/products/bb933735.aspx)
Visual Studio 2005 Code Analyzer, available in:
Visual Studio 2005 Team Edition for Software Developers (http://msdn.microsoft.com/en-us/vstudio/aa718806.aspx)
Visual Studio 2005 Team Suite (http://msdn.microsoft.com/en-us/vstudio/aa718806.aspx)
Web Development Helper - http://www.nikhilk.net/Project.WebDevHelper.aspx
FxCop:
(blog) http://blogs.msdn.com/fxcop/
(download) http://code.msdn.microsoft.com/codeanalysis
Microsoft internal tools you can't have yet:
http://www.microsoft.com/windows/cse/pa_projects.mspx
http://research.microsoft.com/Pex/
http://www.owasp.org/images/5/5b/OWASP_IL_7_FuzzGuru.pdf
Threat modeling
Microsoft Threat Analysis and Modeling Tool v2.1 (TAM) - http://www.microsoft.com/downloads/details.aspx?FamilyID=59888078-9daf-4e96-b7d1-944703479451&displaylang=en
Amenaza: Attack Tree Modeling (SecurITree) - http://www.amenaza.com/software.php
Octotrike - http://www.octotrike.org/
Add-ons for Firefox that help with general web application security
Web Developer Toolbar - https://addons.mozilla.org/firefox/60/
Plain Old Webserver (POW) - https://addons.mozilla.org/firefox/3002/
XML Developer Toolbar - https://addons.mozilla.org/firefox/2897/
Public Fox - https://addons.mozilla.org/firefox/3911/
XForms Buddy - http://beaufour.dk/index.php?sec=misc&pagename=xforms
MR Tech Local Install - http://www.mrtech.com/extensions/local_install/
Nightly Tester Tools - http://users.blueprintit.co.uk/~dave/web/firefox/buildid/index.html
IE Tab - https://addons.mozilla.org/firefox/1419/
User-Agent Switcher - https://addons.mozilla.org/firefox/59/
ServerSwitcher - https://addons.mozilla.org/firefox/2409/
HeaderMonitor - https://addons.mozilla.org/firefox/575/
RefControl - https://addons.mozilla.org/firefox/953/
refspoof - https://addons.mozilla.org/firefox/667/
No-Referrer - https://addons.mozilla.org/firefox/1999/
LocationBar^2 - https://addons.mozilla.org/firefox/4014/
SpiderZilla - http://spiderzilla.mozdev.org/
Slogger - https://addons.mozilla.org/en-US/firefox/addon/143
Fire Encrypter - https://addons.mozilla.org/firefox/3208/
Add-ons for Firefox that help with Javascript and Ajax web application security
Selenium IDE - http://www.openqa.org/selenium-ide/
Firebug - http://www.joehewitt.com/software/firebug/
Venkman - http://www.mozilla.org/projects/venkman/
Chickenfoot - http://groups.csail.mit.edu/uid/chickenfoot/
Greasemonkey - http://www.greasespot.net/
Greasemonkey compiler - http://www.letitblog.com/greasemonkey-compiler/
User script compiler - http://arantius.com/misc/greasemonkey/script-compiler
Extension Developer's Extension (Firefox Add-on) - http://ted.mielczarek.org/code/mozilla/extensiondev/
Smart Middle Click (Firefox Add-on) - https://addons.mozilla.org/en-US/firefox/addon/3885/
Bookmarklets that aid in web application security
RSnake's security bookmarklets - http://ha.ckers.org/bookmarklets.html
BMlets - http://optools.awardspace.com/bmlet.html
Huge list of bookmarklets - http://www.squarefree.com/bookmarklets/
Blummy: consists of small widgets, called blummlets, which make use of Javascript to provide rich functionality - http://www.blummy.com/
Bookmarklets every blogger should have - http://www.micropersuasion.com/2005/10/bookmarklets_ev.html
Flat Bookmark Editing (Firefox Add-on) - http://n01se.net/chouser/proj/mozhack/
OpenBook and Update Bookmark (Firefox Add-ons) - http://www.chuonthis.com/extensions/
Honeyclients, Web Application, and Web Proxy honeypots
Honeyclient Project: an open-source honeyclient - http://www.honeyclient.org/trac/
HoneyC: the low-interaction honeyclient - http://honeyc.sourceforge.net/
Capture: a high-interaction honeyclient - http://capture-hpc.sourceforge.net/
Google Hack Honeypot - http://ghh.sourceforge.net/
PHP.Hop - PHP Honeynet Project - http://www.rstack.org/phphop/
SpyBye - http://www.monkey.org/~provos/spybye/
Honeytokens - http://www.securityfocus.com/infocus/1713
Blackhat SEO and maybe some whitehat SEO
SearchStatus (Firefox Add-on) - http://www.quirk.biz/searchstatus/
SEO for Firefox (Firefox Add-on) - http://tools.seobook.com/firefox/seo-for-firefox.html
SEOQuake (Firefox Add-on) - http://www.seoquake.com/
Application and protocol fuzzing (random instead of targeted)
Sulley - http://fuzzing.org/
taof: The Art of Fuzzing - http://sourceforge.net/projects/taof/
zzuf: multipurpose fuzzer - http://sam.zoy.org/zzuf/
autodafé: an act of software torture - http://autodafe.sourceforge.net/
EFS and GPF: Evolutionary Fuzzing System - http://www.appliedsec.com/resources.html