The power of BIG-IP® Local Traffic Manager™ (LTM) Virtual Edition (VE) is now available in a 90-day trial version, allowing you to test, demo and develop in a trial environment. The supported virtual platform is VMWare ESX(i) v4 and Workstation 7.
BIG-IP LTM VE gives you the same industry leading advanced application delivery capabilities, the flexibility to control traffic with F5 iRules scripting language and simplified deployments with Application Ready Templates. The 90-day trial gives you the ability to test configurations and use iRules to export them to your other BIG-IP devices to experience the ultimate in flexibility.
More info @ the source