Many vendors of commercial test automation tools offer trial versions.
Here are some:
AutoCzar
http://www.testingczars.com/productdownloadpage.php
Automation Anywhere
http://www.automationanywhere.com/download/freeTrial.htm
copyrightjoestrazzere
Badboy
http://www.badboy.com.au/download/index
e-Tester
http://www.oracle.com/technetwork/indexes/downloads/index.html
EggPlant
http://www.testplant.com/free-trial/
JTest
http://www.parasoft.com/jsp/trial_request.jsp?product=Jtest
PesterCat
http://www.pestercat.com/download.html
QA Wizard Pro
http://www.seapine.com/qawizardpro_eval.php
QFS Test
http://www.qfs.de/en/qftest/download.html
QuickTest Pro
https://h10078.www1.hp.com/cda/hpdc/display/main/index.jsp
Ranorex
http://www.ranorex.com/download.html
Rational Functional Tester
http://www-01.ibm.com/software/awdtools/tester/functional/index.html
Rational Robot
http://www-01.ibm.com/software/awdtools/tester/robot/
RoutineBot
http://www.routinebot.com/download
SilkTest
http://www.microfocus.com/products/silk/silktest-product-trial.aspx
SmarteScript
http://www.smartesoft.com/downloads.php
SpiraTest
http://www.inflectra.com/SpiraTest/Demo.aspx
TestComplete
http://smartbear.com/products/qa-tools/automated-testing/sign-up/
TestPartner
http://www.microfocus.com/products/silk/testpartner/index.aspx
Tricentis Testsuite
http://www.tricentis.com/en/tosca/trial/
Visual Studio Test Edition
http://msdn.microsoft.com/en-us/evalcenter/bb633757.aspx
Visual Test
http://www-01.ibm.com/software/awdtools/visualtest/support/download.html
vTask Studio
http://www.vtaskstudio.com/index.php
vTest
http://www.verisium.com/products/evaluation.html
WebTest
http://www.appperfect.com/download/index.html
WebUI Test Studio QA Edition
http://www.telerik.com/automated-testing-tools/products/webui-test-studio-qa-edition.aspx
WinTask
http://www.wintask.com/download-wintask.php
(last updated: September 27, 2011)
