Application Virtualization Software

VMWare ThinApp

http://downloads.vmware.com/d/info/desktop_downloads/vmware_thinapp/4_0

Citrix XenApp

http://www.citrix.com/English/ps2/products/product.asp?contentID=186

Microsoft Application Virtualization

http://www.microsoft.com/systemcenter/appv/default.mspx

Creators of true portable applications

http://en.wikipedia.org/wiki/Portable_application_creators