Sandboxing (for browsers etc):
Best Free Browser Protection Utility
Sandboxie
Aux Browser
GeSWall; download
Bufferzone
SurfCanister
Shade Anti-Malware

System virtualization:
Returnil
Toolwiz Time Freeze
Virtual Protect
Private Workplace
Reboot Restore Rx

Rollback software:
SysRestore
RollBack Home Edition

Locked system:
Toolwiz BHORM

Desktop virtualization:
Mojopac
Icore

Virtual players:
MobaLiveCD

Virtualization software:
Best Free Virtualization Solutions
VirtualBox; Portable-VirtualBox
VMware Server
VMware Player
VirtualPC
VMLite
VMToolkit
Bochs
Client HyperV

Repository of virtual appliances:
Zero Install
Spoon

Application virtualization:
Evalaze
Cameyo
Enigma Virtual Box
InstallFree Nexus
JauntePE
P-Apps

Virtualized browser:
Inmunos
Dell Kace Safe Browser
Browser in the Box 
SecuBrowser

Hypervisors:
VMware vSphere
Microsoft Hyper-V Server
Citrix XenServer Free
Proxmox VE
Oracle VM

Virtualized Linux with Windows:
coLinux
andLinux
Portable Ubuntu Remix

Physical to virtual machine conversion:
VMware vCenter Converter Standalone
Disk2vhd 
Paragon Go Virtual

Steady state using Windows features:
Creating a Steady State by Using Microsoft Technologies
Windows 7 SteadyState solution simplified!
Wioski 
Steadier State

Other:
VMDetectGuard
Introduction to light virtualization

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