http://www.xqual.com/qa/tools.html#Test_Tools_Free

This section will try to keep an as objecive as possible list of interesting tools available on the marketplace.

XQual,Testopia,QAManager,QaTraq,Salome TMF,Test Case Web,TestitoolsTestLink,TestMaster,Rth,CodeSourcery,Concordion,STAF,JUnit,CUnit,CppUnit,PhpUnit,HTMLUnit,XHTMLUnit,HTTPUnit,Google,JWebUnit,Windmill,JFunc,The Grinder,OpenWebLoad,FWPTT,OpenSTA,Curl Loader,AutoIt,AutoHotkey,Marathon,Java.net,Abbot,GUITAR,Expect,QAliber,Tigris,VNCRobot,OpenQA,Magnetic Reason,WatiN,Watir,CubicTest,JBehave,StoryTestIQ,TextTest,Cucumber,Twist,Sahi,Hammerhead,The Grinder,Pylot,OpenSTA,OpenLoad,WebLoad,JCrawler,Hammerora,DieselTest,CLIF,JMeter,SIPr,SIPp,pjsip,Commercial,Borland (Segue),HP (Mercury),Compuware,IBM (Rational),Empirix,UTest,Parasoft,T-Plan,Verisium,Seapine,APTest,QaTraq,PassMark Software,Gurock,Software,Conformiq,OptimalTest,MKS,Origsoft,TestMasters,Zephyr,Nuevosoft,Ken TestMan,CodeSourcery,Inflectra,Prima Software Solutions,Tricentis,JadeLiquid Software,SmarteSoft,TestOptimal,Objentis,mjtnet,TechExcel,InformUP,ID Consultants,@YourSide,Consulting,Testuff,CatchLimited,TOMOS,PractiTest,QMetry,ITCampu,DigitalTester,GenieSys,TestRun,SimpleTestManagement,OpenGroup,FrogLogic,Ranorex,Dartenium,Badboy,iOpus,soapUI,InCisif.net,Minq Software,Quotium,AutomatedQA,Elvior,SoftwareResearch,DurableSoftware,Webius Software,Wintask,Wintask,Origsoft,Plan9 Software,ITKO,Microsoft,Orcanos,Exept Software AG