Some links where you can find portable applications:
PortableApps.com – http://portableapps.com/
Download and install the PortableApp.com Platform setup file and start installing portable apps (and keep them up to date) very easily. Recommended !
Of course you can also just download and install individual Portable Apps.
The Portable Freeware collection – http://www.portablefreeware.com/
Over 300 applications available in a few clicks ! from Liberkey.com – http://www.liberkey.com/
Pendriveapps.com – http://www.pendriveapps.com/
winPenPack X-Software Collection from winPenPack.com – http://www.winpenpack.com
App-Stick.com – http://www.app-stick.com
Portable USB / U3 Apps – Freeware files from Sundrytools.com – http://sundrytools.com/freeware-files/portable-applications/
Portable Apps from fyxm.net (note: not limited to freeware; also contains trials, shareware, …) – http://download.fyxm.net/Portable-apps-14-0-0-0-0.html
Portable Applications from Codyssey.com – http://www.codyssey.com/apps/
Best Free Portable Applications from Gizmo’s freeware – http://www.techsupportalert.com/best-free-portable-programs.htm
100 Portable Apps for your USB Stick (Mac and Win) from MakeUseOf.com – http://www.makeuseof.com/tag/portable-software-usb/
Handy programs to carry on a USB stick from SnapFiles.com – http://www.snapfiles.com/features/ed_usb_software.html
Portable Software – Free Software Downloads from Techbetas.com – http://www.techbetas.com/
32 Useful Portable Apps for Web Designers and Developers from WebDesignBooth.com – http://www.webdesignbooth.com/32-useful-portable-apps-for-web-designers-and-developers/
70 Free Useful Portable Applications You Should Know from HongKiat.com (70 ?) – http://www.hongkiat.com/blog/70-free-useful-portable-applications-you-should-know/
List of portable software from Wikipedia.org – http://en.wikipedia.org/wiki/List_of_portable_applications
Portable Freeware Software from DownloadpediA.org – http://downloadpedia.org/Portable_Freeware_Software
35 Portable Applicatons that Every Tech Needs from EmergingTechs.com – http://www.emergingtechs.com/posts/35-portable-applications-every-tech-needs/
Portable apps from Netbook Freeware – http://www.netbookfreeware.com/tag/portable
— That’s all for now —
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Updates:
06/01/2012:
Added more information on PortableApps.com.
16/03/2011:
Added http://www.snapfiles.com/features/ed_usb_software.html
Added http://downloadpedia.org/Portable_Freeware_Software
Added http://www.liberkey.com/
Added http://sundrytools.com/freeware-files/portable-applications/
We must have our own beliefs.