SymMover!

Windows only: If your primary hard drive just isn't large enough to hold all the software you need on a day-to-day basis, then Steam Mover is the perfect tool for the job, assuming you have another storage drive handy.

PickMeApp is a portable software tool transferring about a million personalized programs from one PC to another. PickMeApp's ‘Add and Remove Programs' like interface guides you through the transfer of selected programs without the need to locate CDs or repeat any lengthy installations. When complete, all your programs and customizations will be transferred intact to the new PC. No changes are made to the original installations, and the transfer can be easily reversed.

Application Mover is a tool that relocates installed programs from one path to another on your hard disk. Application Mover takes files found in the path specified in the 'Current Path' field (see below) and moves them to the 'New Path' path. Application Mover scans the windows registry for references to files located in the 'Current' field and changes those references to the 'New' path. Application Mover also scans all windows shortcuts in the Start Menu and adjusts path references to the new program location. Finally, *.ini and Install.log files present in the original program path are checked for strings matching the old path location. If found, these strings are changed to the new location. Confirmation dialogs are available if you enable the 'Confirm changes' checkbox (see below). If a file is 'busy' and cannot be changed to the new location, a reboot prompt is offered. Pending changes are then completed after the reboot. »

SLM (Steam Library Manager) is a tool designed to backup / restore / move installed Steam applications in ease of use with multi-library support.