Lookup Assistant 2.5 Free Plus Portable
Free (*)Portable
Plus (*)Single Click Lookup 
Free Dictionary/Encyclopedia access Where-to-Lookup Context Menu Configurable per-Lookup Hotkeys Lookup Result Bar and Lookup History Free Online Word Based Games Single Click Arithmetic Calculations Multiple (group) Lookup Where-to-Lookup Configuration Wizard Lookup Anywhere 
Free 
Free
(*) For USB flash drives, USB HDDs, iPods, flash cards. Does not require installation on connected PC.
